B1: Chromosomes and Mitosis

Question 1

what are chromosomes

Answer 1

coiled up lengths of DNA molecules.

Question 2

the cell cycle

Answer 2

a series of stages in the life cycle of a cell

Question 3

first stage- cell growth

Answer 3

the cell increases and grows the amount of subcellular structures

Question 4

second stage- DNA replication

Answer 4

duplicates its DNA to form 2 copies of each chromosome

Question 5

third stage- mitosis

Answer 5

• nuclear membrane breaks down
• chromosomes line up at the centre
• one set of chromosomes is pulled to each
  end of the cell and the nucleus divides
• forming two identical daughter cells