The purpose of DNA or RNA in a virus. A. is to provide instructions to reproduce the virus
B. is to make the host cell replicate itself
C. is to cause the nuclear material to mutate
D. is to destroy the host cell

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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.