Cell Cycle

Question 1

What are the phases of mitosis? What occurs in each one?

Answer 1

Prophase - chromosomes start to condense, nucleolus dissolves
(Prometaphase) - nuclear envelope breaks down
Metaphase - chromosomes align at the metaphase plate, spindles attach to kinetochore
Anaphase - sister chromatids are pulled apart
Telophase - formation of two new nuclei, chromosomes begin to condense, spindle broken down

Question 2

What is G0 phase?

Answer 2

It is an optional quiescence phase.

Question 3

What is G1?

Answer 3

Replication of organelles, mRNA produced and some proteins are produced ready for replication.

Question 4

What is the S phase?

Answer 4

DNA replication. Finishes when all chromosomes have been replicated.

Question 5

What is the G2 phase?

Answer 5

Cell continues to grow. Prepares for mitosis, produces proteins e.g. spindle.

Question 6

What is a mitogen?

Answer 6

A substance which stimulates or induces mitosis.