60 WJEC Biology AS Level - Study And Revision Guide - Neil Roberts (1.6 The Cell Cycle And Cell Division)

Question 1

What does the majority of the cell cycle in eukaryotes involve?

Answer 1

The majority of the cell cycle in eukaryotes involves interphase.

Question 2

What happens during interphase?

Answer 2

During interphase, DNA, protein and organelles are synthesised.

Question 3

What is interphase followed by?

Answer 3

This is followed by four stages of mitosis.

Question 4

What happens during mitosis?

Answer 4

During mitosis, chromosomes are arranged and separated.

Question 5

What happens after mitosis?

Answer 5

After mitosis, there is formation of two genetically identical cells via cytokinesis.

Question 6

Describe the features of interphase?

Answer 6

1. This is the longest phase in the cell cycle.
2. The cell is metabolically very active.
3. The quantity of DNA doubles.
4. The chromosome number actually remains the same
5. The number remains the same as chromosomes exist as two sister chromatids joined together at the centromere.
6. Protein synthesis and organelle replication occur, requiring much ATP.

Question 7

Interphase (Key-Term)

Answer 7

A period of synthesis and growth during the cell cycle.

Question 8

Mitosis (Key-Term)

Answer 8

Involves four stages where chromosomes are arranged and separated prior to cell division.

It results in two genetically identical cells that contain the same number of chromosomes as the parent cell.

Question 9

Cytokinesis (Key-Term)

Answer 9

The division of the cytoplasm to form two daughter cells following mitosis.

Question 10

Draw a diagram of the cell cycle.

Answer 10