The emergency contraceptive pill (morning after pill) is most effective when taken __________.
A. Immediately after intercourse
B. Up to three days after intercourse
C. Within a week of intercourse
D. Daily
E. Once a week
Answer: A
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Which type of cell-surface receptor undergoes changes in phosphorylation in response to binding of its ligand?
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. both the G protein-coupled receptor and the receptor kinase
Cells that are making large quantities of proteins will have numerous
a. centrioles. b. chromosomes. c. cilia. d. plastids. e. ribosomes.
The anthropoids of the Oligocene lived in
a. hot, dry deserts. b. grassy savannas. c. tropical rainforests. d. the watery swamps. e. cool and pleasant mountains.
List three ways in which an RNA molecule differs from a DNA molecule
What will be an ideal response?