Question

Select the correct option:

Read the following statements.
(i) In mitotic cell division chromosome number is halved.
(ii) Kinetochore is the point where two sister chromatids are held together.
(iii) The period between two successive mitotic divisions is known as telophase.
(iv) In $G_1$ phase of cell cycle protein and RNA are synthesised.
Which of the above given statements are correct?

• A. (i) and (iii) only
• B. (ii) and (iii) only
• C. (i) and (iv) only
• D. (ii) and (iv) only

Answer 1

The correct option is D (ii) and (iv) only

Interphase is the period between the end of one cycle of cell division to the beginning of next cell division. It is resting or not dividing phase but it is highly metabolically active phase in which the cell prepare itself for the next cell division.

It is divided into three successive stages the post-mitotic phase, the synthetic phase and pre mitotic phase.

In the first phase, the intensive cellular synthesis takes place and the cell becomes differentiated and synthesis of enzymes and ATP takes place. The size of the cell also increases. During the synthetic face, the DNA replication takes place. it becomes double. Synthesis of histone protein takes place during the premitotic phase.

In the pre-mitotic phase proteins, synthesise begins chromosome condensation factor appears damaged DNA repair.

So, the correct option is '(ii) and (iv) only'