Free The mitotic cell cycle questions for AS Level Biology (9700), part of Cells & molecules. Each question has the answer and the marking points an examiner would look for.
Generate a full The Mitotic Cell Cycle worksheet →All Cells & molecules questionsA diploid cell with 8 chromosomes divides by mitosis.
Which row shows the numbers at anaphase in the whole cell?
| chromosomes (separated chromatids) | DNA molecules | |
|---|---|---|
| A | 8 | 16 |
| B | 8 | 8 |
| C | 16 | 32 |
| D | 16 | 16 |
Answer: D
Telomeres and stem cells are involved in cell division.
1 Telomeres get longer each time a cell divides.
2 Telomeres prevent the loss of genes from the ends of chromosomes during replication.
3 Telomeres code for essential proteins.
Which statements are correct?
Answer: D
Which term is described by this statement?
“Interphase, mitosis and cytokinesis.”
Answer: A
A cell from an organism with a diploid number of 20 is in G2 of the cell cycle.
Which row shows the number of chromosomes and the number of DNA molecules in the nucleus?
| chromosomes | DNA molecules | |
|---|---|---|
| A | 40 | 40 |
| B | 10 | 20 |
| C | 20 | 40 |
| D | 20 | 20 |
Answer: C
In a root tip squash, 40 cells out of 337 were undergoing mitosis. Calculate the mitotic index.
| Part | Answer and marking points | Marks |
|---|---|---|
| 0.119 cells in mitosis ÷ total C1 0.119 A1 | 2 |
Mitosis is part of the cell cycle.
Describe the events of metaphase and anaphase.
Explain the role of telomeres.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | chromosomes at equator; centromeres split, chromatids pulled apart metaphase: chromosomes line up at the equator attached to spindle fibres B1 anaphase: centromeres divide B1 sister chromatids pulled to opposite poles B1 | 3 |
| (b) | prevent loss of genes during replication telomeres are repeated sequences at chromosome ends B1 they prevent loss of genes when DNA is replicated B1 | 2 |
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