Cell Cycle Control

Q.

What are cell cycle checkpoints?

Q.

Which phase marks the period during which DNA Replication of synthesis occurs?

Q.

G₁, G₂ and S phases are seen in which phase of the cell cycle?

1. Prophase

2. Interphase

3. Metaphase

4. Anaphase

Q. All cells in our body divide continuously.

1. False
2. True

Q. If in a dioecious plant, gamete mother cell undergoes meiosis but crossing over does not occur then

यदि एकलिंगाश्रयी पादप में युग्मक मातृ कोशिका में अर्धसूत्री विभाजन होता है परन्तु विनिमय नहीं होता है, तो

1. All the gametes would always be genetically identical
   
   सभी युग्मक सदैव आनुवंशिक रूप से समान होंगे
2. There would be formed four genetically different types of gametes
   
   आनुवंशिक रूप से भिन्न प्रकार के चार युग्मक बनेंगे
3. Gametes would not be formed
   
   युग्मकों का निर्माण नहीं होगा
4. Genetically two different types of gametes would be formed
   
   आनुवंशिक रूप से भिन्न प्रकार के दो युग्मक बनेंगे

Q. Energy requirement for cell division is high.

1. False
2. True

Q.

Read the following statements regarding "Regulation of cell division” and identify the incorrect statement(s).

I. Regulation of cell division is a natural and an inherited property of a cell.

II. Contact inhibition is a method of regulation of cell division.

III. Regulation of cell division can also be inhibited by anchorage dependence of a cell.

IV. Anchorage dependence and contact inhibition increase the growth of cells and ensure that high cell density is maintained at all times.

1. I & II
2. II $\&$ III
3. III $\&$ I
4. IV only

Q.

Which of these would be required for the regulation of cell cycle ?

1. CDK

2. Cyclin

3. Cyclin-CDK Complex

4. Phosphorylated CDK

Q.

Which one of these is NOT an in-built property of the cell to prevent unwanted division?

1. Contact inhibition
2. Anchorage dependence
3. Cell cycle checkpoints
4. DNA repair mechanism