Which of these events occurs first in seed
germination?
a. activation of protein-digesting enzymes in the
endosperm
b. release of gibberellins
c. absorption of water
d. transcription of the amylase gene
e. digestion of endosperm starch into transportable
sugars
Answer: c
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The distribution of different organisms over the
surface of the earth a. offers evidence for evolution. b. provides evidence for a single center of evolution. c. appears to be simply a matter of chance. d. is not affected by biogeographical features. e. is primarily the result of human activities.
The area indicated by “A” in the figure represents
a. sunlight energy in the environment. b. heat energy in the environment. c. electrical energy in the environment. d. ionizing radiation in the environment. e. the explosion of the hydrogen gas to release energy for the reactions.
T cell receptors recognize ______, distinguishing cells that belong to the body from infected body cells.
A. antigens B. MHC markers C. antigens and MHC markers D. complement E. cytokines and complement
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a molecule made by linking three glucose molecules together by dehydration reactions?
A) C18H36O18 B) C18H32O16 C) C6H10O5 D) C18H30O15 E) C3H6O3