Initiation of the assembly of mitotic spindle and the complete disintegration of the nuclear envelope can be observed in respectively
| 1. | Prophase and anaphase I. |
| 2. | Metaphase and telophase. |
| 3. | Prophase and metaphase. |
| 4. | Metaphase and metaphase-I. |
During cell cycle, events are under
1. Genetic control
2. Metabolic control
3. Cytoplasmic control
4. Mitochondrial control
| 1. | Pachytene | 2. | Diplotene |
| 3. | Diakinesis | 4. | Zygotene |
| 1. | leptotene | 2. | zygotene |
| 3. | diplotene | 4. | pachytene |
Match the following Column-I with Column-II.
| Column-I | Column-II | ||
| A. | Synapsis aligns homologous chromosomes |
(i) | Anaphase II |
| B. | Synthesis of RNA and protein | (ii) | Zygotene |
| C. | Action of enzyme recombinase | (iii) | G2 - phase |
| D. | Centromeres do not separate, but chromosomes move towards opposite poles | (iv) | Anaphase I |
| (v) | Pachytene |
| 1. | A-(ii), B-(i), C-(iii), D-(iv) | 2. | A-(ii), B-(iii), C-(v), D-(iv) |
| 3. | A-(i), B-(ii), C-(v), D-(iv) | 4. | A-(ii), B-(iii), C-(iv), D-(v) |
Consider the following four statements (I- IV) related to cell cycle, and select the correct option stating them as true (T) and false (F).
| I. | Cell growth in terms of cytoplasmic increase is a continuous process. |
| II. | Interphase is the phase of actual cell division. |
| III. | The number of chromosomes doubles in S-phase. |
| IV. | The cell that does not divide further exits G1-phase to enter a metabolically inactive stage. |
Options:
I II III IV
| 1. | T F F F |
| 2. | F T T T |
| 3. | F F T T |
| 4. | T F F T |
The microtubules from the opposite poles of the spindle attach to the pair of homologous chromosomes in
| 1. | Metaphase - I |
| 2. | Prophase - I |
| 3. | Metaphase |
| 4. | Metaphase - II |
Which of the following stages of Meiosis I of Prophase I is not correctly matched with events occurring during that stage?
|
|
Stage |
Event |
|
1. |
Zygotene |
Pairing between homologous chromosomes |
|
2. |
Pachytene |
Crossing over between sister chromatids of homologous chromosomes |
|
3. |
Diplotene |
Tendency of recombined homologues to separate |
|
4. |
Diakinesis |
Terminalization of chiasmata |
Cells in phase:
1. terminate the cell cycle
2. exit the cell cycle
3. enter the cell cycle
4. suspend the cell cycle
The correct sequence of phases in cell cycle is:
1.
2.
3.
4.