Cell Cycle and Cell Division TS

\(
\text{If a cell had } 4\ (\text{2 pairs})\ \text{chromosomes at } G_1 \text{ phase, what would be the number of chromosomes in this cell at the end of anaphase?}
\)

The diagram shows cytokinesis in animal cell [I] and in plant cell [II]. What will be correct for A, B and C in these cells?

\(
\begin{array}{|l|l|l|}
\hline & \text { Animal cell } & \text { Plant cell } \\
\hline \text { A } & \begin{array}{l}
\text { Furrow formed using } \\
\text { actin and myosin }
\end{array} & \begin{array}{l}
\text { Vesicles from Golgi move to } \\
\text { centre }
\end{array} \\
\hline \text { B } & \begin{array}{l}
\text { The furrow reaches } \\
\text { centre from periphery }
\end{array} & \begin{array}{l}
\text { Tubular structures merge to } \\
\text { form plasma membrane }
\end{array} \\
\hline \text { C } & \text { Cells pinched apart } & \begin{array}{l}
\text { Pectins deposited leading to } \\
\text { formation of middle lamella }
\end{array} \\
\hline
\end{array}
\)

\(
\begin{array}{|l|l|}
\hline \text { 1. Only A and B } & \text { 2. Only A and C } \\
\hline \text { 3. Only B and C } & \text { 4. A, B and C } \\
\hline
\end{array}
\)

The diagram given shows a hypothetical scheme of evolution of mitosis. A, B, C and D are evidences for this evolution scheme from living organisms, for example, A represents bacteria where binary fission is considered as a precursor of mitosis. Identify B, C and D:

\(
\begin{array}{|l|l|l|l|}
\hline & \text { B } & \text { C } & \text { D } \\
\hline \text { 1. } & \text { Dinoflagellates } & \text { Diatoms } & \text { Eukaryotes } \\
\hline \text { 2. } & \text { Diatoms } & \text { Euglenoids } & \text { Eukaryotes } \\
\hline \text { 3. } & \text { Yeasts } & \text { Dinoflagellates } & \text { Archaebacteria } \\
\hline \text { 4. } & \text { Diatoms } & \text { Dinoflagellates } & \text { Eukaryotes } \\
\hline
\end{array}
\)

A and B in the given diagram are events seen in Meiosis I and C and D are events seen in Meiosis II. Identify the correct match:

\(
\begin{array}{|c|l|}
\hline \text { A } & \text { Prophase I and arrow shows chiasmata } \\
\hline B & \begin{array}{l}
\text { Anaphase I and arrow shows sister chromatids } \\
\text { associated at centromere }
\end{array} \\
\hline C & \begin{array}{l}
\text { Prophase II and arrows show attachment of spindle } \\
\text { microtubules to kinetochore }
\end{array} \\
\hline D & \begin{array}{l}
\text { Anaphase II and the diagram shows separated sister } \\
\text { chromatids after the split of centromere }
\end{array} \\
\hline
\end{array}
\)

\(
\begin{array}{|l|l|}
\hline \text { 1. Only A, B and C } & \text { 2. Only A, C and D } \\
\hline \text { 3. Only B, C and D } & \text { 4. A, B, C and D } \\
\hline
\end{array}
\)

At which stage of the cell cycle is the cell shown in the given diagram?

\(
\begin{array}{|l|l|}
\hline \text { 1. } G_1 & \text { 2. S } \\
\hline \text { 3. } G_2 & \text { 4. M } \\
\hline
\end{array}
\)

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in

Anaphase promoting complex (APC) is necessary for proper mitosis of animal cells. Its main function is to

Proteins are synthesized in preparation for mitosis during:

The centrosome duplicates in:-

\(
\begin{array}{|l|l|}
\hline \text { 1. Early Prophase } & \text { 2. Late Prophase } \\
\hline \text { 3. S phase } & \text { 4. } \mathrm{G}_2 \text { phase } \\
\hline
\end{array}
\)

\(
\text { Cells which are not dividing are likely to be at }
\)

\(
\begin{array}{|l|l|}
\hline \text { 1. } G_1 & \text { 2. } G_2 \\
\hline \text { 3. } G_0 & \text { 4. S phase } \\
\hline
\end{array}
\)

The cells in the quiescent stage \(
\left[G_0\right]
\) phase of the cell cycle:

Cells at the end of prophase, when viewed under the microscope, show:

Liquid endosperm in coconut forms due to: