Which statement 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°C.
B) Growth and reproduction occur year-round in deserts.
C) Desert plants typically produce very few seeds.
D) Many desert animals are nocturnal.
Answer: D
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The GAG codon, which codes for glutamic acid, is mutated to GUG, which now codes for valine. What type of mutation is this?
A. silent B. missense C. nonsense D. frameshift E. base pair deletion
. The main forms of nitrogen taken up by plant roots and useful to plants is:
A. N-N B. nitrite C. nitrite and nitrate D. ammonia and N-N E. nitrate and ammonia
Kinetic organisms can move themselves by all except:
a. flagella. b. jet propulsion. c. undulation of the body. d. using turbulent mixing.
Viruses that infect and lyse cancer cells are called
a) oncogenic viruses. b) latent viruses. c) oncolytic viruses. d) lysogenic viruses.