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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_____ is when antibodies are directed to the base membranes in organs.
Fill in the blank(s) with the appropriate word(s).
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