Post Video Test - Cell Cycle and Cell divisionContact Number: 8527521718Post Video Test - Cell Cycle and Cell divisionContact Number: 8527521718In bacteria the cell cycle is divided into:
1. Only 1 phase
2. Two stages
3. Three periods
4. Four classes
The G0 stage of the cell cycle is irreversible in:
I. Quiescent cells
II. Senescent cells
III. Terminally differentiated cells
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
If a cell in S phase is fused with a cell in G1:
1. The G1 nucleus immediately enters the S phase
2. The S nucleus stops DNA replication
3. The G1 nucleus directly enters G2 phase
4. Both nuclei enter the M phase immediately
A point in the animal cell cycle at which the cell becomes "committed" to the cell cycle occurs in:
1. G1
2. S
3. G2
4. M
During what phase in the cell cycle would you find the most DNA per cell?
1. G1
2. G2
3. S
4. Prophase II
The stage phase of the cell cycle that is expected to be most variable in duration in different types of cells in an animal will be:
1. G1
2. S
3. G2
4. M
Onion root tip cell has 16 chromosomes in each cell. How many chromosomes will the cell respectively have at G1 phase, after S phase and after M phase?
1. 16, 32, 16
2. 16, 32, 8
3. 16, 16, 8
4. 16, 16, 16
Destruction of both centrosomes with a laser beam in an animal cell:
1. will prevent both mitosis and cytokinesis
2. prevents cytokinesis even if mitosis has been completed normally
3. permits cytokinesis but the daughter cells fail to enter a new S phase
4. prevents mitosisbut permits cytokinesis
Which of the following statements is not true for cancer cells in relation to mutations?
| 1. | Mutations in proto-oncogenes accelerate the cell cycle. |
| 2. | Mutations destroy telomerase inhibitor |
| 3. | Mutations inactivate the cell control. |
| 4. | Mutations inhibit production of telomerase. |
Telomerase is an enzyme which is a:
1. Ribonucleoprotein
2. Simple protein
3. RNA
4. Repetitive DNA
Which stage of meiosis is shown in the diagram given below?
In meiosis:
| 1. | A single round of DNA replication is followed by two sequential divisions with two chromosome number and DNA content getting reduced twice |
| 2. | A single round of DNA replication is followed by two sequential divisions with two chromosome number getting reduced twice and DNA content getting reduced once |
| 3. | A single round of DNA replication is followed by two sequential divisions with chromosome number getting reduced once and DNA content getting reduced twice |
| 4. | A single round of DNA replication is followed by two sequential divisions with two chromosome number and DNA content getting reduced once |
The mechanisms that contribute to the genetic variation arising from sexual reproduction include:
| I. | Independent assortment of chromosomes |
| II. | Crossing over |
| III. | Random fertilization |
1. I and II only
2. I and III only
3. II and III only
4. I, II and III
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
A prolonged resting phase in oogenesis as seen in many vertebrate occytes is called as:
1. Intekinesis
2. Diakinesis
3. Dictyotene
4. Prometaphase II