Coreceptor inhibitors block HIV infection by preventing which of the following?
A) binding of the HIV virion onto the plasma membrane
B) binding of the HIV virion onto the CCR5 receptor
C) binding of the HIV virion onto the gp120 protein
D) degrading the coreceptor so the virion cannot attach
E) binding of the HIV virion onto the CD4 receptor
B
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During reproduction, male scorpions release a spermatophore (packet of sperm) into the environment. The female scorpion will take the spermatophore up into her body where it will be used to fertilize her eggs. True or False
This is an example of internal fertilization. A. true B. false
Which of the following is a characteristic of temperate forests?
a. deciduous trees b. evergreen conifers c. infrequent precipitation d. diversity of tree species
If you mutate the gene encoding a Cdk such that Cdk protein product cannot bind to cyclin, what effect would you expect to see?
A) Cdk will be unaffected. B) The cell cycle will be up-regulated, and the cells will proliferate. C) Cdk will be inactive, so the target proteins will not be phosphorylated. D) Cdk will be constitutively active, so the cell cycle will be unchecked. E) Cdk will phosphorylate its target proteins regardless of the cell cycle.
Which of the following best describes the condition in which the terminal bud of many plants produces hormones that inhibit growth of axillary buds?
A) biennial B) secondary growth C) apical dominance D) germination