cell division

Question 1

what are chromosomes made up of ?

Answer 1

consist of DNA molecules combined with proteins- they contain the genes provided fro photosynthesis.

Question 2

how many chromosomes are found in the nucleus of human body cells?

Answer 2

46

Question 3

what is a gene?

Answer 3

section of DNA that codes for a protein

Question 4

how many chromosomes are found in the nucleus of gametes.

Answer 4

23

Question 5

how many chromosomes arranged in a nucleus of the body cells?

Answer 5

arranged in pairs - 46 chromosomes form 23 pairs

Question 6

what are the three main stages of the cell cycle

Answer 6

1) replication of DNA and synthesis of organelles
2)mitosis
3)division of the cell

Question 7

list six things that happened in the cell cycle

Answer 7

stage 1 -interphase-
1)DNA replicates
2)number of sub-cellular structures

stage 2 - mitosis-
1)chromosomes line up into the centre of the cell
2)chromosomes pulled to opposite ends of the cell.
3)nucleus divides.

stage 3 - cytokinesis
1)cytoplasm and cell membrane divide
2) a new cell membrane forms
3) 2 identical daughter cells form

Question 8

why is mitosis important?

Answer 8

• produces identical cells which all have the same information.

-produces additional cells for growth and repair