Lecture 7 - The Cell Cycle

Question 1

What is the cell cycle?

Answer 1

repeating pattern of cell growth followed by nuclear and then cytoplasmic division (meiosis/mitosis the cytokinesis)

Question 2

What are the 4 main stages/phases of the cell cycle?

Answer 2

1. Gap (G)
2. Synthesis (S)
3. Gap 2 (G2)
4. Mitosis or Meiosis
   1 - 3 are called interphase

Question 3

what is diffusion?

Answer 3

nutrients from capillary to cell; works other way round

Question 4

What happens during interpahse?

Answer 4

the cell grows and the DNA is duplicated

Question 5

What happens during the m phase?

Answer 5

the duplicated chromosomes are segregated and distributed into daughter nuclei

Question 6

what happens in G1?

Answer 6

• from birth of cell to start of DNA replication
• chromosomes not dividing
• cell grows & utilizes its genetic info to manufacture molecules it needs to carry out functions
• length varies between cells

Question 7

what happens in S?

Answer 7

• chromosomes double to form “sister chromatids” joined by centromere
• chromosomes condense at start of M phase

Question 8

what happens in G2?

Answer 8

• time between the S phase & start of M phase
• cell growths in concentrates on synthesis of protein that are required for nuclear division