Carrots are orange because of which pigment?
a. anthocyanin
b. beta-carotene
c. chlorophyll a
d. chlorophyll b
e. phycoerythrobilin
B
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The reason(s) that the body has such difficulty combating HIV infection and preventing progression to AIDS is because
A. HIV mutates slowly. B. HIV targets both humoral and cell-mediated immunity. C. HIV blocks antigen recognition by macrophages. D. HIV destroys MHC molecules. E. HIV blocks the inflammatory response.
Leaves on the lower part of a bush primarily feed the ____
a. roots b. leaf tips c. stems d. upper leaves e. flowers
The helical coil shape of an ?-helix fibrous protein provides what type of property to that protein?
a. rigidity b. strength c. elasticity d. heat tolerance
e. water retention_____ is when antibodies are directed to the base membranes in organs.
Fill in the blank(s) with the appropriate word(s).