HIV spikes attach to CD4+ receptors found on

A) T helper cells.
B) macrophages.
C) dendritic cells.
D) T helper cells and macrophages.
E) T helper cells, macrophages, and dendritic cells.


E

Biology & Microbiology

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The dominance of what species in upper intertidal zones is an indication of heavy wave action?

a. Barnacles b. Periwinkles c. Mussels d. Limpets

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After cell division, some cells become differentiated. This means that they 

A. become different shapes. B. become different sizes. C. perform different functions. D. become different in all these ways.

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Stems and roots grow in length by the addition of new cells produced in

A. companion cells B. apical meristems C. leaves D. dermal tissue

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Saltwater fish lose water by osmosis.

a. true b. false

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