B2.1 Cell division

Question 1

the nucleus of a cell is made up of what

Answer 1

chromosomes made of DNA molecules

Question 2

each chromosome carries large numbers of what

Answer 2

genes

Question 3

in body cells, the chromosomes are normally found in what

Answer 3

pairs

Question 4

where does in a pair of chromosomes come from

Answer 4

1 dad and 1 mum

Question 5

what is mitosis

Answer 5

cell division required for growth and repair

Question 6

how many stages does the cell cycle have

Answer 6

3

Question 7

how long can stage 1 last for

Answer 7

a few hours or years depending on the age of the tissue

Question 8

what happens in stage 1 of the cell cycle

Answer 8

identical copies of DNA are made and sub-cellular structures increase

Question 9

what happens in stage 2 of the cell cycle

Answer 9

mitosis- 1 set of chromosomes is pulled to each end of the cell

Question 10

what happens in stage 3 of the cell cycle

Answer 10

cytoplasm and cell membrane divide to form 2 genetically identical cells

Question 11

mitosis is essential for what

Answer 11

growth and repair

Question 12

takes place when

Answer 12

organisms repair itself

Question 13

genes are what

Answer 13

a section of DNA which controls part of a cells chemistry

Question 14

what are chromosomes

Answer 14

thin strands of DNA