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.
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A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?
A. The adhesion of water molecules to the needle B. The heat capacity of water C. The solubility of water D. The cohesion of water molecules to each other
Choanoflagellates are ____
a. heterotrophs b. chemoautotrophs c. autotrophs d. phototrophs e. halotrophs
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).
Which of the following stimuli do vertebrates not have a specialized receptor for?
A. Smell B. Humidity C. Vision D. Hearing E. Taste