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
| 1. | Chromosomes decondense and lose their individuality during anaphase |
| 2. | Spindle fibres attach to kinetochores of chromosomes during early prophase |
| 3. | Centriole begins to move towards opposite poles of the cell during metaphase |
| 4. | DNA is replicated during S-phase of cell cycle |
Interkinesis stage of cell cycle
| 1. | Is generally short lived |
| 2. | Shows DNA duplication |
| 3. | Is generally long lived |
| 4. | Is followed by prophase-I |
Select the incorrect statement
| 1. | Yeast can progress through the cell cycle in about 90 minutes |
| 2. | DNA synthesis is a continuous process in cell cycle |
| 3. | Duration of I-phase in the cell cycle is more than 95% |
| 4. | Events of cell cycle are under genetic control |
Cells that do not divide further exit G1 phase to enter an inactive stage called
| 1. | G2 phase |
| 2. | G0 stage |
| 3. | S-phase |
| 4. | M-phase |
Select the odd one out with respect to mitosis
| 1. | It helps the organisms in both sexual and asexual reproduction |
| 2. | It is called equational division |
| 3. | It takes place only in diploid cells of plants |
| 4. | It helps in cell repair |
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