HIV destroys the immune system by primarily destroying
A) cytotoxic T cells.
B) B cells.
C) helper T cells.
D) erythrocytes.
C) helper T cells.
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According to the concept of ___________, species evolve continuously over long spans of time.
Fill in the blank(s) with the appropriate word(s).
Facilitated diffusion is specific, which indicates that ____
a. a specific protein will transport certain polar or charged molecules but not others b. only one specific integral protein per membrane is involved in this process c. the energy molecule ATP is specifically required for transport d. only specific hydrophobic molecules can be transported
e. transport of molecules occurs only in specific cellsIf a pigment absorbed violet, yellow, orange,
red, and green light, what color would it appear to be?
a. white b. brown c. black d. blue e. none of these
Why does the cell perform endocytosis in addition to active and passive transport?
What will be an ideal response?