Cell Cycle

Question 1

Why cells divide

Answer 1

GROWTH (increase cell number)
REPLACEMENT of old/damaged cells
REPRODUCE in asexual reproduction

Question 2

Mitosis and meiosis both carry out

Answer 2

Nuclear division

Cytokinesis

Question 3

Stages of cell cycle

Answer 3

G1 growth of cytoplasm + organelle
S DNA synthesis
G2 growth+ ATP production for mitosis
M + cytokinesis cell division
G0-non dividing cells: specialised/damaged

Question 4

Mitosis stages

Answer 4

Prophase
Metaphase
Anaphase
Telophase
Cytokinesis

Question 5

Prophase

Answer 5

Nuclear envelope dissolved
Chromosomes are condense and distinct
Centriole divided
Nucleolus is less prominent

Question 6

Metaphase

Answer 6

Chromosomes in the metaphase plate/equator
Centrioles produce spinal fibres
Spinal fibres attach to chromosomes

Question 7

Anaphase

Answer 7

Spinal fibres pull identical chromatids to the poles
By contracting
Which requires ATP

Question 8

Telophase

Answer 8

Nuclear envelope starts reforming
Chromatids uncoil-less distinct

Question 9

Cytokinesis

Answer 9

Cytoplasm divided
Animal-constriction
Plant- new cell wall built

Question 10

Describe a chromosome

Answer 10

2 sister chromatids joined at the centromere