The five different immunoglobulin classes are distinguished by their
a. CH regions.
b. C? regions.
c. D regions.
d. JH regions.
e. VH regions.
Ans: a
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A leaf that is found to have stomata and epidermal hairs in depressions in the leaf surface probably came from a plant that is adapted to a(n) ________ climate
a. arctic b. arid c. cool and rainy d. tropical
The process in which NH4
+ is oxidized to NO3 ? is called
a. nitrification. b. ammonification. c. nitrogen cycling. d. nitrogen fixation. e. nitrogen assimilation.
Which of the following statements is correctly
related to the opening of stomata?
a. potassium is pumped into the guard cells and water follows by osmosis b. potassium and water are both actively pumped into the guard cells c. potassium is pumped out of the guard cells and water follows by osmosis d. potassium and water are both actively pumped out of the guard cells e. none of these statements is correctly related to the opening of stomata
Which of the following statements regarding vision is not true?
A. Rhodopsin is found in the membrane of rods. B. Insects and birds can often see into the ultraviolet range. C. Vertebrate rods and cones hyperpolarize in response to light. D. Bright light will often produce action potentials in both rods and cones.