How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?
1. | They have twice the amount of cytoplasm and half the amount of DNA. |
2. | THey have half the number of chromosomes and half the amount DNA. |
3. | They have the same number of chromosomes and half the amount of DNA. |
4. | They have half the number of chromosomes and one-fourth the amount of DNA. |
If the DNA content of an onion tip cell is 2C at the end of the M-phase, what would be its DNA content at the end of the S-phase?
1. C
2. 2C
3. 3C
4. 4C
The cell shown in the given diagram is in:
1. Early prophase
2. Late prophase
3. Metaphase
4. Telophase
In oocyte of some vertebrates, the stage of meiosis I that can last for months or years would be:
1. Zygotene
2. Pachytene
3. Diplotene
4. Diakinesis
At what phase of meiosis are homologous chromosomes separated ?
1. Prophase l
2. Prophase ll
3. Anaphase l
4. Anaphase ll
The following cell, undergoing mitosis, is at:
1. | Early prophase |
2. | Late prophase |
3. | Transition to metaphase |
4. | Early metaphase |
Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?
1. | Chromosomes will not condense |
2. | Chromosomes will be fragmented |
3. | Chomosomes will not segregate |
4. | Recombinantion of chromosome arms will occur |
DNA replication in bacteria occurs
(1) during S-phase
(2) within nucleolus
(3) prior to fission
(4) just before transcription
Which of the following options gives the correct sequences of events during mitosis?
1. | Condensation → nuclear membrane disassembly → crossing over → Segregation → telophase |
2. | Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → Segregation → telophase |
3. | Condensation → crossing over → nuclear membrane disassembly → Segregation → telophase |
4. | Condensation → arrangement at equator → centromere division → Segregation → telophase |
During cell growth, DNA synthesis takes place in
1. S-phase
2. -phase
3. -phase
4. M-phase