0 of 50 Questions completed
Questions:
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
You must first complete the following:
0 of 50 Questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
Select the incorrect statement about submetacentric chromosomes
(b)
The incorrect statement about submetacentric chromosomes is (2) “Chromosomes have equal arms called p arm and q arm” because in submetacentric chromosomes, the arms are not equal, with one arm being slightly shorter than the other, making them heterobrachial;Â hence, option (2) is the incorrect statement.Â
Which of the following represents a typical plant cell?
(c)
In summary, while sieve tube cells and tracheids are essential for plant function, they are specialized cells with structures adapted for specific roles, differing from the generalized structure of a typical plant cell. Therefore, the onion peel cell best represents a typical plant cell
The number of microtubule doublets and triplets in flagella and centriole are respectively
(a)
Centrioles: Centrioles are cylindrical structures composed of 9 sets of microtubule triplets, arranged in a radial symmetry. Each triplet consists of three microtubules: A, B, and C. This 9+0 arrangement is typical for centrioles.
Therefore, the number of microtubule doublets in flagella is 9, and the number of microtubule triplets in centrioles is 9. Thus, the correct pairing is 9 and 9
Cyanobacteria are not expected to have:
\(
\begin{array}{|l|l|}
\hline \text { 1. Chromatophores } & \text { 2. Nitrogenase } \\
\hline \text { 3. Flagella } & \text { 4. Gas vacuoles } \\
\hline
\end{array}
\)
(c)
 Mannans, Xylans, Alginic acid and sultonated polysaccharides are seen in the cell walls of:
\(
\begin{array}{|l|l|}
\hline \text { 1. Algae } & \text { 2. Archaebacteria } \\
\hline \text { 3. Fungi } & \text { 4. Plants } \\
\hline
\end{array}
\)
(a)
Consider the given two statements:
I. Chloroplasts are considered endosymbiotic Cyanobacteria.
II. Cyanobacteria consist of free-living photosynthetic bacteria.
(b)
Which of the following statements is true for a secretory cell?
(b)
Incorrect. The Golgi apparatus is present in secretory cells. It processes and packages proteins synthesized in the rough endoplasmic reticulum (RER) for secretion.
2. Rough Endoplasmic Reticulum (RER) is easily observed in the cell
Correct. Secretory cells, such as pancreatic acinar cells, have abundant RER due to their role in synthesizing proteins for secretion. The presence of ribosomes on the RER gives it a rough appearance, making it easily observable under a microscope.
3. Only Smooth Endoplasmic Reticulum (SER) is present
Incorrect. While SER is involved in lipid synthesis and detoxification, secretory cells primarily rely on RER for protein synthesis. Therefore, both RER and SER are present, but RER is more prominent in secretory cells.
4. Secretory granules are formed in nucleus
Incorrect. Secretory granules are not formed in the nucleus. They are formed in the Golgi apparatus, where proteins synthesized in the RER are packaged into vesicles for secretion
Consider the following two statements:
I. Secondary constrictions can be used as markers to identify the particular SAT chromosomes.
II. The secondary constrictions are always constant in their positions.
(a)
The largest structures passed through the nuclear pores are:
(d)
In a comparison of a typical bacterial cell and a typical human cell, which of the following would be higher for a bacterial cell?
(d)
In the ultrastructure of cilia/ flagella, the radial spokes connect one of the tubules of each peripheral doublet to:
(c)
In a eukaryotic cell, the two organelles that can transform energy are:
(d)
In eukaryotic cells, the two organelles that transform energy are:
Mitochondria – involved in cellular respiration (converting glucose into ATP)
Chloroplasts – involved in photosynthesis (converting light energy into chemical energy in plants)
These organelles are:
Semi-autonomous: They have their own DNA and ribosomes, and they can reproduce independently of the cell.
Bound by a double membrane: Not a single membrane.
Not part of the endomembrane system: They function independently of it.
Chloroplasts are present only in plant cells, but mitochondria are found in both plant and animal cells.
Â
The space between the two nuclear membranes is called the perinuclear space and is continuous with the:
(c)
The perinuclear space is the space between the inner and outer membranes of the nuclear envelope. This space is:
Continuous with the lumen of the rough endoplasmic reticulum (RER) because the outer nuclear membrane is physically connected to the RER membrane.
1. Nuclear pore complex: These are structures that regulate transport between the nucleus and cytoplasm but are not a space.
2. Cytoplasm: The cytoplasm surrounds the nucleus but is not the same as the perinuclear space.
4. Golgi lumen: The Golgi apparatus is a separate organelle and not directly continuous with the nuclear envelope.
Consider the given two statements:
I. Cytoplasmic streaming is more important in plant and algal cells than in animal cells
II. Plant and algae cells are generally larger than animal cells
Â
(a)
In general, the functions of the vacuole include all except:
(d)
 Maintaining an alkaline internal pH – False: Vacuoles generally have an acidic pH, not alkaline, to help in degradation processes and maintaining ion balance.
Identify the correct order of organisation of genetic material from largest to smallest:
(b)
Which of the following is an incorrect statement?
(c)
Mature sieve tube elements (in phloem tissue of plants) lack a nucleus and most organelles to facilitate efficient transport of sugars. They rely on companion cells for metabolic support.
Match the following columns and select the correct option :
\(
\begin{array}{|l|l|l|l|}
\hline & \text { Column – I } & & \text { Column – II } \\
\hline \text { (a) } & \begin{array}{l}
\text { Smooth endoplasmic } \\
\text { reticulum }
\end{array} & \text { (i) } & \text { Protein synthesis } \\
\hline \text { (b) } & \text { Rough endoplasmic reticulum } & \text { (ii) } & \text { Lipid synthesis } \\
\hline \text { (c) } & \text { Golgi complex } & \text { (iii) } & \text { Glycosylation } \\
\hline \text { (d) } & \text { Centriole } & \text { (iv) } & \begin{array}{l}
\text { Spindle } \\
\text { formation }
\end{array} \\
\hline
\end{array}
\)
\(
\begin{array}{|l|l|l|l|l|}
\hline & \text { (a) } & \text { (b) } & \text { (c) } & \text { (d) } \\
\hline \text { 1. } & \text { (ii) } & \text { (i) } & \text { (iii) } & \text { (iv) } \\
\hline 2 . & \text { (iii) } & \text { (i) } & \text { (ii) } & \text { (iv) } \\
\hline 3 . & \text { (iv) } & \text { (ii) } & \text { (i) } & \text { (iii) } \\
\hline 4 . & \text { (i) } & \text { (ii) } & \text { (iii) } & \text { (iv) } \\
\hline
\end{array}
\)
(a)
An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called –
(c)
Consider the given two statements:
I. Several antibiotics (notably the penicillins and cephalosporins) stop bacterial infections by interfering with cell wall synthesis
II. Such antibiotics have no effects on human cells which have no cell wall, only a cell membrane
(b)
The key concept missing is the mechanism of selective toxicity — why the antibiotic targets bacterial cells and why it doesn’t harm human cells. A complete explanation would involve:
Biochemical specificity: Penicillins and cephalosporins target specific bacterial enzymes (like transpeptidases, also known as penicillin-binding proteins) involved in the synthesis of peptidoglycan, a component unique to bacterial cell walls.
Absence in human cells: Human cells do not have peptidoglycan or those specific enzymes, so these antibiotics have nothing to act on in human cells.
The given diagram :
I. shows the diagrammatic representation of the ultrastructure of centriole
II. shows the 9+2 arrangement of the axonemal microtubules of cilia/flagella
(c)
Its diagramatic structure of cilia and flagella from NCERT
Consider the two statements:
Statement I: Both the cilium and the flagellum emerge from centriole-like structure called the basal body.
Statement II: Basal body, centrioles, cilia and flagella have identical arrangement of microtubules in their ultrastructure.
(a)
This structure is typically referred to as the “9+0” or “9+2” pattern of microtubules:
Centrioles and basal bodies have a “9+0” arrangement: 9 triplets of microtubules arranged in a circle, with no central pair.
Cilia and flagella have a “9+2” arrangement: 9 doublets in a ring with 2 single microtubules in the center.
Match column I with column II and select the correct option from the codes given below.
\(
\begin{array}{|l|c|c|l|}
\hline \text { } & \text { Column I } & \text { } & \text { Column II } \\
\hline \text { (A) } & \text { Chloroplasts } & \text { (i) } & \begin{array}{l}
\text { Colourless } \\
\text { plastids }
\end{array} \\
\hline \text { (B) } & \begin{array}{c}
\text { Chromoplas } \\
\text { ts }
\end{array} & \text { (ii) } & \begin{array}{l}
\text { Yellow, orange or } \\
\text { red coloured } \\
\text { plastids }
\end{array} \\
\hline \text { (C) } & \text { Leucoplasts } & \text { (iii) } & \text { Green plastids } \\
\hline
\end{array}
\)
Â
(a)
The total length of DNA molecules of 46 chromosomes in a human cell is about ……… whereas a typical cell is 10 m in length
(a)
Both the nuclear membranes are separated by ________ in perinuclear space.
(c)
You cannot copy content of this page