Chapter 4 - Cell Division and Reproduction

Question 1

What is the Cell Theory?

Answer 1

1. All living things are composed of one or more cells.
2. Cells are the smallest living things.
3. New cells come from only pre-existing cells by cell division.

Question 1

What is Genetics?

Answer 1

The study of heredity and variation of living organisms

Question 2

Which kind of cells go through the cell cycle?

Answer 2

Somatic Cells

Question 3

What are the three functions of the cell cycle?

Answer 3

1. Growth
2. Repair
3. Maintenance to replace dead cells

Question 4

What are the three stages of the cell cycle?

Answer 4

1. Interphase
2. Mitosis (Cell division)
3. Cytokinesis

Question 5

What are the stages of Interphase?

Answer 5

1. G1- Gap 1 or Growth 1. All parts of the cell except the nucleus is duplicated. Eg: Mitochondria, Golgi Bodies, ER
2. S - The DNA is in the form of chromatin. The chromatin is duplicated.
3. G2 - Gap 2 or Growth 2. The cell checks the duplicated chromosomes for errors and corrects it if they find any.

Question 6

What is PMAT?

Answer 6

It is the stages of Mitosis:
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

Question 7

What happens in prophase?

Answer 7

• The chromatin condenses in to a chromatid. They are held together by a centromere.
• The centrosomes move to the opposite poles of the cell.
• Nucleolus disappears and nuclear membrane starts to break down.