Which of the following statements about deserts and the organisms that live there is true?
A) Air temperatures in cold deserts, such as those west of the Rocky Mountains, may never fall below 30 degrees C.
B) Growth and reproduction occur year-round in deserts.
C) Deserts typically occur at the equator.
D) Desert plants typically produce very few seeds.
E) Many desert animals are nocturnal.
Ans: E) Many desert animals are nocturnal.
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Gibberellins have their most dramatic effects
a. on leaves. b. in promoting abscission. c. on fruit ripening. d. on stem lengthening. e. on flowers.
Plasma proteins that attack foreign proteins and pathogens are ________.
A) clotting proteins B) fibrinogens C) immunoglobulins D) albumins E) metalloproteins
Which of the following is a phototroph?
A) a tree B) a mushroom C) soil bacterium D) an earthworm E) a person
Atoms with eight electrons in their outer shells tend to:
A) form covalent bonds. B) be stable and unreactive. C) be chemically reactive. D) form ionic bonds.