Question

The cell cycle may be stopped or slowed by

a. low levels of caspase enzymeb.

b.high levels of survivin enzyme

c. the proper alignment of chromosomes

d. shortened telomeres

e. DNA damage

Answer 1

The cell cycle can be defined as "the series of events taking place during the division of the cell with DNA duplication, division of nucleus (karyokinesis) and division of cytoplasm (cytokinesis)."

There are four main phases of cell cycle

1. Gap1 or G1 phase
2. S or synthesis phase
3. Gap 2 or G2 phase
4. Mitotic phase

The system which controls the cell cycle allows the entry to another phase only when previous phase is complete. A control system which initiate and terminate the chemical reactions in the cell cycle and ensures the DNA replication once in S phase.

Answer: e. The DNA damage detection by the control system or unreplicated DNA detection may stop or slow down the cell cycle process .