In what direction do the sugars in a peach tree move?
A) only toward the fruit
B) only toward the sugar source
C) only toward a sugar sink
D) either toward or away from sugar sources
C
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Which of the following is a similarity between plant and animal development?
A. Cell migration occurs during both plant and animal development. B. Both plant and animal development rely on morphogens deposited in the oocyte. C. The developmental patterns of both plants and animals rely on transcription factors. D. Both plants and animals have numerous somatic cells that are totipotent. E. Both plant and animal development use a group of homeotic genes called MADS box genes.
Approximately ____ percent of water that enters a plant’s roots is used for photosynthesis and other parts of
metabolism and growth.
a. 1-3 b. 2-5 c. 5-10 d. 15-20 e. 25-30
Next to carbon and oxygen, the element organisms most require is
A. sulfur. B. phosphorus. C. nitrogen. D. iron.
What type of channel opens in response to changes in ionic charge across a membrane?
a. an electric-gated channel b. a charge-gated channel c. a ligand-gated channel d. a voltage-gated channel