Mitosis

Question 1

When does the cell cycle begin?

Answer 1

When a cell has been produced by cell division

Question 2

How does the cell cycle end?

Answer 2

When the cell dividing produces two indentical cells

Question 3

What are the two stages of the cell cycle?

Answer 3

Cell growth

Cell division

Question 4

What is the stage of cell growth called?

Answer 4

Interphase

Question 5

What are the three separate stages within interphase?

Answer 5

G1
S
G2

Question 6

What happens in the G1 stage of interphase?

Answer 6

Cell grows and new organelles are made

Question 7

What happens in the S stage of interphase?

Answer 7

DNA replicates itself to make it ready for mitosis

Question 8

What happens in the G2 stage of interphase?

Answer 8

The cell keeps growing and proteins needed for cell division are made

Question 9

Which part of the cycle does the cell spend most of its time in?

Answer 9

Interphase

Question 10

Briefly, what happens during mitosis?

Answer 10

A parent cell divides to produce two genetically identical daughter cells

Question 11

What is mitosis needed for?

Answer 11

Growth of multicellular organisms and repairing damaged tissues

Question 12

What are the 4 stages of mitosis?

Answer 12

Prophase
Metaphase
Anaphase
Telephase

Question 13

When mitosis begins, what are the chromosomes joined up in the middle by?

Answer 13

Centromere

Question 14

What are two strands of the same chromosome called?

Answer 14

Sister chromatids

Question 15

What happens in prophase?

Answer 15

1) chromosomes condense
2) centrioles move to polar edges of the cell
3) spindle fibres form
4) nuclear envelope breaks down

Question 16

What happens in metaphase?

Answer 16

1) chromosomes line up in the middle

2) spindle fibres attach to the centromeres

Question 17

What happens in anaphase?

Answer 17

1) the centromeres divide
2) spindle fibres pull the chromosomes apart to separate ends of the cell
3) the chromatids make a V shape

Question 18

What happens in telophase?

Answer 18

1) the chromatids reach opposite ends of the cell

2) nuclear envelope forms around the groups of chromosomes to form two nuclei

Question 19

What is cytokinesis?

Answer 19

The cytoplasm dividing

Question 20

What is cancer?

Answer 20

Tumour that invades surrounding tissue

Question 21

How is a tumour formed?

Answer 21

When a cell divides uncontrollably

Question 22

Give an example of a drug which prevents the synthesis of enzymes needed for DNA replication.

Answer 22

Chemotherapy

Question 23

How is radiation used as a treatment for cancer?

Answer 23

they damage DNA
at certain parts in the cycle its checked for damage
if damage is found, the cell kills itself