A ____ is an extracellular signaling molecule that exerts its effect at very low concentrations
a. statolith
b. protein receptor
c. plant hormone
d. cytochrome
e. phytochrome
ANSWER: c
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How many varieties of apples account for 90% of the apples sold in U.S. grocery stores today?
a. 5 b. 15 c. 25 d. 50 e. 150
Describe the general structure of a transcription factor
What will be an ideal response?
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