cell biology - cell division by mitosis

Question 1

where are chromosomes found? + made of?

Answer 1

in the nucleus
made of the molecule DNA

Question 2

how many chromosomes do the body cells contain?

Answer 2

two of each = paired

Question 3

how many chromosomes does the human body cell contain?

Answer 3

23 pairs

Question 4

chromosomes of gamete?

Answer 4

chromosomes not paired e.g human gamete have 23 single chromosomes

Question 5

what do chromosomes carry?

Answer 5

a large number of genes which determine many of our features

Question 6

what is the cell cycle?

Answer 6

where cells have to divide

Question 7

what happens in the first stage of the cell cycle/mitosis?

Answer 7

DNA replicates to form two copies of each chromosome. cell grows and copies its internal structures such as mitochondria and ribosomes

Question 8

what happens in second stage of cell cycle?

Answer 8

mitosis takes place. one set of chromosomes is pulled to each end of the cell. the cell nucleus divides

Question 9

what happens in final stage of cell cycle?

Answer 9

cytoplasm and cell membrane divide to form two identical cells

Question 10

what are the functions of mitosis?

Answer 10

1. essential for growth and development of multicellular organisms (plant and animal)
2. takes place when an organism repairs itself ( eg broken bone heals )
3. happens during asexual reproduction