To infect a cell, HIV must

A. bind both CD4 and a cytokine co-receptor.
B. bind both CD8 and a cytokine co-receptor.
C. bind both CD8 and a class I MHC protein.
D. kill cytotoxic T cells and bind CD4.


A. bind both CD4 and a cytokine co-receptor.

Biology & Microbiology

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A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?

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Choanoflagellates are ____

a. heterotrophs b. chemoautotrophs c. autotrophs d. phototrophs e. halotrophs

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In polygenic inheritance, such as height and skin color in humans, several genes each contribute to the overall phenotype in ______ degrees

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following stimuli do vertebrates not have a specialized receptor for?

A. Smell B. Humidity C. Vision D. Hearing E. Taste

Biology & Microbiology