Topic 4: Cell Cycle - For Growth and Repair + Interphase

Question 1

What is the general result in the cell cycle?

Answer 1

• to turn a somatic “parent” cell (2n) to 2 identical somatic “daughter” cells (2n)

Question 2

What are the two stages of the cell cycle?

Answer 2

• interphase
• mitotic (M) / cell division phase

Question 3

What stages occur in interphase, and what does the cell still do despite being in this stage? (3)

Answer 3

• G1, S G2 phase
• chromosomes present as chromatin
• normal cellular metabolic activities occurring (ie. protein synthesis)

Question 4

What occurs in the G1 phase? (3)

Answer 4

• growth
• metabolism
• centrosome replication begins

Question 5

What is the G0 phase? (2)

Answer 5

• some cells do not divide again once they mature
• remain permanently in G1

Question 6

What occurs in the S phase of interphase? (4)

Answer 6

• chromosomes replicate, but are still present as chromatin (not individually visible)
• ALWAYS occurs before division (mitosis and meiosis)
• replicates are called sister chromatids
• kinetochore proteins are produced and attach to each centromere to form the kinetochore

Question 7

What is the area called in which sister chromatids are attached to each other?

Answer 7

• centromere

Question 8

What is a kinetochore? (2)

Answer 8

• a protein and DNA complex, 1 chromatid
• site of attachment of spindle microtubules

Question 9

What occurs in the G2 phase of interphase? (2)

Answer 9

• growth and metabolism
• production of enzymes and other proteins needed for cell division