Let a cell's generation time is 1 minute. In 20 minutes a culture tube (culture medium) is 1/8th filled with cells. When the tube will be fullfilled?

1.	21 minutes
2.	23 minutes
3.	60 minutes
4.	160 minutes

The following diagram refers to a typical cell cycle.

Identify the parts marked as X, Y and Z.

1. X - G₁; Y - S; Z - G₂                      2. X - G₂; Y - S; Z - G₁

3. X - G₀; Y - S; Z - G₂                     4. X - G₁; Y - G₂; Z - G₀

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:

(1) Metaphase I    

(2) Metaphase II  

(3) Anaphase I     

(4) Anaphase II

At which stage of meiosis does the genetic constitution of gametes is finally decided:

(1) Metaphase I    

(2) Anaphase II    

(3) Metaphase II   

(4) Anaphase I

Select the correct statement about G₁ phase:

(1) Cell is metabolically inactive

(2) DNA in the cell does not replicate

(3) It is not a phase of synthesis of macromolecules

(4) Cell stops growing

A. Most dramatic period of cell cycle involving a major reorganization of virtually all components of the cell
B. It represents the phase when the actual cell division occurs
These statements (A & B) are concerned with
1. S-phase
2. G₁ phase
3. M-phase
4. G₂ phase

Select the correct statement

Interkinesis stage of cell cycle

Select the incorrect statement

Cells that do not divide further exit G₁ phase to enter an inactive stage called