The infection cycle of HIV includes all of the following steps except
A. attachment.
B. entry.
C. replication.
D. immediately killing the host cell.
E. viral DNA integrates into the host chromosome.
D. immediately killing the host cell.
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What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?
A. They are all linked to protein kinase activation. B. They associate with protein bound to guanidine phosphates. C. They open ion channels. D. They bind similar hormones. E. They change their conformation when bound to a hormone.
The function of nectar is
A. provision of carbohydrates for the plant. B. attraction of pollinators. C. preservation of delicate flower parts. D. a sticky trap for parasitic insects. E. prevention of desiccation.
Which animal phylum has an asymmetrical body plan?
a. Cnidaria b. Ctenophora c. Echinodermata d. Porifera e. Annelida
A controlled experiment _____
A) is repeated many times to ensure that the results are accurate B) includes at least two groups, one of which does not receive the experimental treatment C) includes at least two groups, one differing from the other by two or more variables D) includes one group for which the scientist controls all variables