Which is the role of restriction enzymes?

a) to isolate the selected gene
b) to cut dna into fragments to different lengths
c) to move and separate the strands of dna
d) to join the sticky ends of dna fragments

the correct answer for this question is option b

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

c. the initial amount of money placed in the savings account