Molecular basis of Inheritance NCERT

Question 1 of 60

1. Question

1 point(s)

The figure shows a polynucleotide chain.

\(
\begin{array}{|l|l|}
\hline \begin{array}{l}
\text { Statement } \\
\text { I: }
\end{array} & \begin{array}{l}
\text { A is the 5′ end of the polynucleotide chain and } \\
\text { B is the 3′ end of the polynucleotide chain. }
\end{array} \\
\hline \begin{array}{l}
\text { Statement } \\
\text { II: }
\end{array} & \begin{array}{l}
\text { The nitrogenous bases linked to sugar moiety } \\
\text { project from the backbone. }
\end{array} \\
\hline
\end{array}
\)

Statement I is correct, Statement II is incorrect
Statement I is incorrect, Statement II is correct
Statement I is incorrect, Statement II is incorrect
Statement I is correct, Statement II is correct

Question 2 of 60

2. Question

1 point(s)

Consider the following Statements :-

\(
\begin{array}{|l|l|}
\hline \text { I: } & \begin{array}{l}
\text { DNA – deoxyribonucleic acid – is the genetic } \\
\text { material, at least for the majority of organisms. }
\end{array} \\
\hline \text { II: } & \begin{array}{l}
\text { RNA though it also acts as a genetic material in some } \\
\text { viruses, mostly functions as a messenger. }
\end{array} \\
\hline \text { III. } & \begin{array}{l}
\text { RNA can function as an adapter, structural, and in } \\
\text { some cases as a catalytic molecule. }
\end{array} \\
\hline
\end{array}
\)

Only I and II are correct
Only I and III are correct
Only II and III are correct
I, II, and III are correct

Question 3 of 60

3. Question

1 point(s)

Study the structure of double-stranded nucleotide chain given below and select the correct statements :

\(
\begin{array}{|l|l|}
\hline \begin{array}{l}
\text { Statement } \\
\text { I: }
\end{array} & \begin{array}{l}
\text { A shows the hydrogen bonds where a triple } \\
\text { bond links Guanine and Cytosine and a double } \\
\text { bond links Adenine and Thymine. }
\end{array} \\
\hline \begin{array}{l}
\text { Statement } \\
\text { II: }
\end{array} & \begin{array}{l}
\text { If Adenine in such a dsDNA molecule is } \\
\text { found to be } 20 \%, \text { the amount of Cytosine in } \\
\text { this ds DNA molecule is expected to be } 20 \% .
\end{array} \\
\hline
\end{array}
\)

Statement I is correct, Statement II is incorrect
Statement I is incorrect, Statement II is correct
Statement I is incorrect, Statement II is incorrect
Statement I is correct, Statement II is correct

Question 4 of 60

4. Question

1 point(s)

To form a nucleoside, a nitrogenous base is linked to a pentose sugar :
\(
\begin{array}{|c|l|}
\hline \text { 1. } & \begin{array}{l}
\text { Through a P-Glycosidic linkage at carbon atom } \\
\text { number 1 }
\end{array} \\
\hline \text { 2. } & \begin{array}{l}
\text { Through a P-Glycosidic linkage at carbon atom } \\
\text { number 5 }
\end{array} \\
\hline \text { 3. } & \begin{array}{l}
\text { Through an N-Glycosidic linkage at carbon atom } \\
\text { number 1 }
\end{array} \\
\hline \text { 4. } & \begin{array}{l}
\text { Through an N-Glycosidic linkage at carbon atom } \\
\text { number 5 }
\end{array} \\
\hline
\end{array}
\)

1
2
3
4

Question 5 of 60

5. Question

1 point(s)

The diagram shows the DNA double helix. What will be true for the helix ?

\(
\begin{array}{|l|l|}
\hline \text { I. } & \begin{array}{l}
\text { A represents a base pair where the plane of one base } \\
\text { pair stacks over the other in the double helix giving } \\
\text { the helix more stability in addition to hydrogen } \\
\text { bonds. }
\end{array} \\
\hline \text { II. } & \begin{array}{l}
\text { There are } 10 \text { base pairs in one complete turn of B- } \\
\text { dNA. }
\end{array} \\
\hline \text { III. } & \text { B is the backbone constituted by sugar-phosphate. } \\
\hline \text { IV. } & \begin{array}{l}
\text { The two strands are parallel-oriented in the same } \\
\text { direction with respect to each other. }
\end{array} \\
\hline \text { V: } & \text { The diameter is uniform, around } 2.0 \mathrm{~nm} . \\
\hline
\end{array}
\)

Only I , II and III
Only II, III , IV and V
Only I, II , III and V
I, II , III , IV and V

Question 6 of 60

6. Question

1 point(s)

According to Erwin Chargaff, in a double-stranded DNA :-

The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant and equal.
The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant but are not equal to one
The ratios between Adenine and Guanine, and, Thymine and Cytosine are constant and equal
The ratios between Adenine and Guanine, and, Thymine and Cytosine are constant but are not equal to one

Question 7 of 60

7. Question

1 point(s)

The central dogma of molecular biology is an explanation of the flow of genetic information within a biological system :

Statement I: A is ‘replication‘ where DNA is replicated in a semi-conservative manner.
Statement II: B is ‘transcription‘ and is so called because the language of RNA is only a slight variant of the language of the DNA.
Statement III: C is ‘translation‘ and is so called because the language of Protein is entirely different from the language of RNA.

Statement I is correct, Statement II is incorrect, Statement III is incorrect
Statement I is correct, Statement II is correct, Statement III is incorrect
Statement I is correct, Statement II is correct, Statement III is correct
Statement I is incorrect, Statement II is incorrect, Statement III is incorrect

Question 8 of 60

8. Question

1 point(s)

Question 9 of 60

9. Question

1 point(s)

Question 10 of 60

10. Question

1 point(s)

Question 11 of 60

11. Question

1 point(s)

The structure of nucleosome is shown below :

I: A is H1 histone.
II: B is a tetramer made of histone proteins.

Statement I is correct, Statement II is incorrect.
Statement I is incorrect, Statement II is correct.
Statement I is incorrect, Statement II is incorrect.
Statement I is correct, Statement II is correct.

Question 12 of 60

12. Question

1 point(s)

Question 13 of 60

13. Question

1 point(s)

Question 14 of 60

14. Question

1 point(s)

The given figure shows the Electron Microscope ‘beads-on-string’ structure of :

Nucleosome
Solenoid
Filament
Metaphase Chromosome

Question 15 of 60

15. Question

1 point(s)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { The distance between the two strands of } \\
\text { the DNA helix is approximately uniform. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { base pairing is complementary where a } \\
\text { purine always base pairs with a } \\
\text { pyrimidine and a pyrimidine always base } \\
\text { pairs with a purine. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
Both (A) and (R) are false.

Question 16 of 60

16. Question

1 point(s)

Consider the two statements:
\(
\begin{array}{|l|l|}
\hline \text { I: } & \begin{array}{l}
\text { If the sequence of bases in one strand of a double- } \\
\text { stranded DNA is known, then the sequence in other } \\
\text { strands can be predicted. }
\end{array} \\
\hline \text { II: } & \begin{array}{l}
\text { If each strand from a DNA acts as a template for the } \\
\text { synthesis of a new strand, the two double-stranded } \\
\text { DNA thus, produced would be identical to the } \\
\text { parental DNA molecule. }
\end{array} \\
\hline
\end{array}
\)

Only I is correct
Only II is correct
Both I and II are correct
Both I and II are incorrect

Question 17 of 60

17. Question

1 point(s)

Histones are rich in amino acids :

Arginine and Lysine
Arginine and Leucine
Arginine and Isoleucine
Aspartate and Glutamate

Question 18 of 60

18. Question

1 point(s)

Study the illustration of the basic steps of the Hershey–Chase experiment and select the correct statements from the given experiments :

I: ‘A‘ shows that viruses grown on radioactive sulfur contained radioactive protein but not radioactive DNA because DNA does not contain sulfur.
II. ‘B‘ shows that viruses are grown in the presence of radioactive phosphorus contained radioactive DNA but not radioactive protein because DNA contains phosphorus but protein does not.
III: The result ‘X‘ shows bacteria that were infected with viruses that had radioactive DNA were radioactive, indicating that DNA was the material.
IV. The result ‘Y‘ shows bacteria that were infected with viruses that had radioactive proteins were not radioactive indicating that proteins did not enter the bacteria from the viruses.

Only Statement I and Statement II.
Only Statement I and Statement III.
Only Statement I and Statement IV.
Only Statement III and Statement IV.

Question 19 of 60

19. Question

1 point(s)

Given below are two statements : one is labelled as
Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { A set of positively charged and basic } \\
\text { proteins are used in the packaging of } \\
\text { Eukaryotic DNA. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { DNA molecule is acid and carries a } \\
\text { negative charge. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A)
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
Both (A) and (R) are false

Question 20 of 60

20. Question

1 point(s)

During DNA packaging in eukaryotic cells, Non-Histone Chromosomal proteins :

Are not required
Are required from the beginning to the end of the packaging
Are required only for earlier stages of packaging
Are required for a higher level of packaging

Question 21 of 60

21. Question

1 point(s)

Given below are two statements : one is labelled as
Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { Euchromatin is said to transcriptionally } \\
\text { active protein. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { Heterochromatin is said to be } \\
\text { transcriptionally inactive. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
Both (A) and (R) are false.

Question 22 of 60

22. Question

1 point(s)

The given Fig. Shows :-

Watson and Crick's model for semi-conservative DNA replication
Temin and Baltimore model for reverse transcription
Transcription of rRNA and tRNA on the template of DNA
Transcription of mRNA and hnRNA on the template of DNA

Question 23 of 60

23. Question

1 point(s)

In Griffith’s experiment, which of the following bacterial strains was capable of causing pneumonia in mice ?

Live R
Bacteria strain with polysaccharide coat
Heat Killed S
Live R with capsule and Heat Killed S

Question 24 of 60

24. Question

1 point(s)

Given below are two statements : one is labelled as
Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { S-strain of Streptococcus pneumoniae is } \\
\text { virulent. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { Heat-killed S-strain Streptococcus } \\
\text { pneumoniae injected into mice did not } \\
\text { cause pneumonia and did not kill them. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
(A) is true but (R) is false.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Both (A) and (R) are false.

Question 25 of 60

25. Question

1 point(s)

Given below are two statements : one is labelled as
Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { In Avery, Macleod, and McCarty’s } \\
\text { experiment, digestion of heat-killed } \\
\text { lysate with proteases and RNases did not } \\
\text { affect transformation but digestion with } \\
\text { DNase did. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { DNase will hydrolyse all biomolecules in } \\
\text { the lysate except DNA. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

(A) is true but (R) is false.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Both (A) and (R) are false.

Question 26 of 60

26. Question

1 point(s)

The figure shows the Meselson and Stahl experiment. Identify the correct statements :

I: The result at the end of 20 minutes excludes the ‘conservative’ mode of DNA replication.
II: The result at the end of 40 minutes excludes the ‘dispersive’ mode of DNA replication.

Statement I is correct, Statement II is incorrect.
Statement I is incorrect, Statement II is correct.
Statement I is incorrect, Statement II is incorrect.
Statement I is correct, Statement II is correct.

Question 27 of 60

27. Question

1 point(s)

Given below are two statements : one is labelled as
Assertion (A) and the other is labelled as Reason (R)
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { Even after the results of Avery, Macleod, } \\
\text { and McCarty’s experiment, not all } \\
\text { biologists were convinced that DNA is } \\
\text { hereditary material. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { Proteins were conclusively proved to be } \\
\text { the genetic material for almost all living } \\
\text { organisms. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are false.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.

Question 28 of 60

28. Question

1 point(s)

Given below are two statements : one is labelled as
Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { A molecule that can act as a genetic } \\
\text { material should be able to express itself } \\
\text { in the form of ‘Mendelian Characters’. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { A molecule that can act as a genetic } \\
\text { material should provide the scope for } \\
\text { slow changes. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are false.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.

Question 29 of 60

29. Question

1 point(s)

Consider the two statements:-

\(
\begin{array}{|l|l|}
\hline \begin{array}{l}
\text { Statement } \\
\text { I: }
\end{array} & \begin{array}{l}
\text { There is now enough evidence to suggest that } \\
\text { essential life processes (such as metabolism, } \\
\text { translation, splicing, etc.), evolved around } \\
\text { RNA. }
\end{array} \\
\hline \begin{array}{l}
\text { Statement } \\
\text { II: }
\end{array} & \begin{array}{l}
\text { DNA being double-stranded and having } \\
\text { complementary strands further resists changes } \\
\text { by evolving a process of repair. }
\end{array} \\
\hline
\end{array}
\)

Statement I is correct, Statement II is correct
Statement I is correct, Statement II is incorrect
Statement I is incorrect, Statement II is correct
Statement I is incorrect, Statement II is incorrect

Question 30 of 60

30. Question

1 point(s)

The figure shows the replicating fork during DNA replication. Identify the correct statements.

Statement I: A is an Okazaki fragment and such fragments make up the lagging strand which is replicated away from the replication fork.
Statement II: B is the leading strand that is continuously replicated towards the replication fork.

Statement I is correct, Statement II is incorrect.
Statement I is incorrect, Statement II is correct.
Statement I is incorrect, Statement II is incorrect.
Statement I is correct, Statement II is correct.

Question 31 of 60

31. Question

1 point(s)

Who proposed a semi-conservative mode of replication for DNA?

Watson and Crick
Meselson and Stahl
Hershey and Chase
Beadle and Tatum

Question 32 of 60

32. Question

1 point(s)

The daughter DNA that was extracted from the culture one generation after the transfer from \(
{ }^{15} \mathrm{~N} \text { to }{ }^{14} \mathrm{~N}
\) medium had:

Low density
Intermediate density
High density
One had low and another had high density

Question 33 of 60

33. Question

1 point(s)

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { Deoxyribonulceoside triphosphates } \\
\text { provide energy for polymerization } \\
\text { reactions during the replication of DNA. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { The two terminal phosphates in a } \\
\text { deoxynucleoside triphosphate are high- } \\
\text { energy phosphates, the same as in the } \\
\text { case of ATP. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

(A) is true but (R) is false.
Both A and R are false.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Both (A) and (R) are true and (R) is the correct explanation of (A).

Question 34 of 60

34. Question

1 point(s)

The figure shows the process of transcription in eukaryotes. Identify the incorrect statements regarding the process :

Only Statement I and Statement III
Only Statement II and Statement III
Only Statement II and Statement IV
Only Statement I and Statement V

Question 35 of 60

35. Question

1 point(s)

Consider the following statements :
\(
\begin{array}{|l|l|}
\hline \text { I. } & \begin{array}{l}
\text { Deoxyribonucleoside triphosphates act as substrates } \\
\text { as well as provide energy for polymerization reaction } \\
\text { during DNA replication. }
\end{array} \\
\hline \text { II. } & \begin{array}{l}
\text { The replication of DNA is both semiconservative and } \\
\text { semi-discontinuous }
\end{array} \\
\hline \text { III. } & \begin{array}{l}
\text { In bacterial DNA replication, there are multiple ori } \\
\text { and replication fork moving bi-directionally }
\end{array} \\
\hline
\end{array}
\)
Which of the above statements are true ?

I and II only
I and III only
II and III only
I, II, and III

Question 36 of 60

36. Question

1 point(s)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { For long DNA molecules, the replication } \\
\text { occurs within a small opening of the } \\
\text { DNA helix, referred to as the replication } \\
\text { fork. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { The DNA polymerases on their own } \\
\text { cannot initiate the process of replication. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Both (A) and (R) are false.
(A) is true but (R) is false.

Question 37 of 60

37. Question

1 point(s)

The DNA dependent polymerases catalyze:

\(
\text { Only in 3′ – 5′ direction }
\)
\( \text { Only in 5’ – 3’ direction } \)
In both directions
In neither directions

Question 38 of 60

38. Question

1 point(s)

The codons represented as YYY and ZZZ in the given figure, respectively, can be :

\(
5^{\prime}-\mathrm{AGU}-3^{\prime} \text { and } 5^{\prime}-\mathrm{UAC}-3^{\prime}
\)
\( \text { 3′-AGU-5′ and 3′-UAC-5′ } \)
\( 5^{\prime}-\mathrm{TCA}-3 \text { ‘ and 5′-ATG-3’ } \)
\( \text { 3′-TCA -5′ and 3′-ATG-5′ } \)

Question 39 of 60

39. Question

1 point(s)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { A piece of DNA if needed to be } \\
\text { propagated during recombinant DNA } \\
\text { procedures requires a vector. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { The vectors provide the origin of } \\
\text { replication. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are false.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.

Question 40 of 60

40. Question

1 point(s)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { The replication of DNA and cell division } \\
\text { cycle should be highly coordinated. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { In eukaryotes, the replication of DNA } \\
\text { takes place at the S-phase of the cell } \\
\text { cycle. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true but (R) is not the correct explanation of (A).
Both (A) and (R) are false.
Both (A) and (R) are true and (R) is the correct explanation of (A).
(A) is true but (R) is false.

Question 41 of 60

41. Question

1 point(s)

What defines a coding and a template strand in the transcription unit ?

Structural gene
Ori
Terminator
Promoter

Question 42 of 60

42. Question

1 point(s)

In the given figure Identify A to D :-

\(
\begin{array}{|l|l|l|l|l|}
\hline & \text { A } & \text { B } & \text { C } & \text { D } \\
\hline \text { 1. } & \text { Amino acid binding site } & \text { DHU loop } & \text { Anticodon } & \text { T } \Psi \text { loop } \\
\hline \text { 2. } & \text { Amino acid binding site } & \text { T } \Psi \text { C loop } & \text { Anticodon } & \text { DHU loop } \\
\hline \text { 3. } & \text { Anticodon } & \text { DHU loop } & \text { Amino acid binding site } & \text { T } \Psi \text { C loop } \\
\hline \text { 4. } & \text { Anticodon } & \text { T } \Psi \text { C loop } & \text { Amino acid binding site } & \text { DHU loop } \\
\hline
\end{array}
\)

1
2
3
4

Question 43 of 60

43. Question

1 point(s)

Consider the following statements :
\(
\begin{array}{|c|l|}
\hline \text { I. } & \begin{array}{l}
\text { All the reference point while defining a transcription } \\
\text { unit is made with the coding strand. }
\end{array} \\
\hline \text { II. } & \begin{array}{l}
\text { It is the presence of a promoter in a transcription unit } \\
\text { that also defines the template and coding strands. }
\end{array} \\
\hline \text { III. } & \begin{array}{l}
\text { Exons are said to be sequences that do not appear in } \\
\text { mature or processed RNA. }
\end{array} \\
\hline
\end{array}
\)
Which of the above statements are true ?

I and II only
I and III only
II and III only
I, II, and III

Question 44 of 60

44. Question

1 point(s)

Study the diagram of the lac operon given below and select the correct statements :

Statement I: This is the working of a lac operon in the absence of an inducer.
Statement II: Repressor binds to the operator region and allows RNA polymerase to transcribe the operon.

Only Statement I
Only Statement II
Both Statement I and Statement II
Neither Statement I nor Statement II

Question 45 of 60

45. Question

1 point(s)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { It is necessary to define the boundaries } \\
\text { that would demarcate the region and the } \\
\text { strand of DNA that would be transcribed. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { Reason: Both strands of DNA are not } \\
\text { copied during transcription. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are false.
(A) is true but (R) is false.
Both (A) and (R) are true but (R) is not the correct explanation of (A)

Question 46 of 60

46. Question

1 point(s)

Question 47 of 60

47. Question

1 point(s)

Consider the transcription unit given in the following diagram and choose the correct statements :

I. The promoter on the promoter is situated upstream and 5′ to the structural gene.
II. It is the presence of the structural gene that defines the template strand.
III. The coding strand does not code for anything and is displaced during transcription

I and II only
I and III only
II and III only
I, II, III

Question 48 of 60

48. Question

1 point(s)

Question 49 of 60

49. Question

1 point(s)

Study the diagram given below and choose the correct information that can be deduced :

The core RNA polymerase is capable of catalyzing elongation only.
Sigma factor and Rho factor are needed for the termination of transcription.
DNA Helicase opens the strand of the DNA.
Both strands of DNA are transcribed by the same RNA polymerase.

Question 50 of 60

50. Question

1 point(s)

Question 51 of 60

51. Question

1 point(s)

Question 52 of 60

52. Question

1 point(s)

Consider the following diagram showing the working of the lac operon in E.coli in the presence of an inducer and choose the correct statement from the ones given below :

A is the inducer and can be either lactose or cAMP.
B is the enzyme that will metabolize glucose, the preferred energy source.
Some amount of C will be present in the cell even if lactose is absent.
The absence of D will stop lactose from entering the cell.

Question 53 of 60

53. Question

1 point(s)

Question 54 of 60

54. Question

1 point(s)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { Both the strands of DNA are not copied } \\
\text { during transcription. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { Both strands of DNA are identical in } \\
\text { their base composition. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

(A) is true but (R) is false.
Both (A) and (R) are false.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Both (A) and (R) are true and (R) is the correct explanation of (A).

Question 55 of 60

55. Question

1 point(s)

The DNA from the crime scene matches that of individual B
VNTRs are hypervariable
The larger fragments remain near the point of introduction in the gel electrophoresis
The smaller chromosomes in the human genome have smaller repeats of VNTR

Question 56 of 60

56. Question

1 point(s)

Which of the following is true for both transcription and DNA replication ?

The principle of complementarity governs the processes
Only if the two strands act as a template
Only a segment of both strands is involved
Adenine base pairs with thymine

Question 57 of 60

57. Question

1 point(s)

Question 58 of 60

58. Question

1 point(s)

The DNA profiles below represent four different individuals. Which of the following statements is consistent with the results ?

B is the child of A and C.
C is the child of A and B.
D is the child of B and C.
A is the child of B and C.

Question 59 of 60

59. Question

1 point(s)

Question 60 of 60

60. Question

1 point(s)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R)
\(
\begin{array}{|l|l|}
\hline \text { Assertion (A): } & \begin{array}{l}
\text { In transcription, the strand that does not } \\
\text { code for anything is referred to as the } \\
\text { coding strand. }
\end{array} \\
\hline \text { Reason (R): } & \begin{array}{l}
\text { It is the presence of the promoter in a } \\
\text { transcription unit that defines the } \\
\text { template and coding strands. }
\end{array} \\
\hline
\end{array}
\)
In the light of the above statements, choose the most appropriate answer from the options given below :

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Both (A) and (R) are false.
(A) is true but (R) is false.

NEET BIOLOGY TEST SERIES

Molecular basis of Inheritance NCERT

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❌ Why R does NOT explain A:

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❌ Why R does not explain A:

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🔶 Reason (R):

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What happens after 1 generation?

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❌ **Why R does not explain A:**