Why is the axon the only cellular projection in sensory neurons?
What will be an ideal response?
Sensory neurons do not receive signals from other cells, so the axon is their only cytoplasmic extension. One end of this axon has receptor endings that detect a specific stimulus; the other has signal-sending axon terminals. Interneurons and motor neurons both receive and send signals, so they have dendrites as well as an axon.
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Where do the molecules used as the inputs of the Calvin cycles (ATP and NADPH) come from?
A. They come from previous Calvin cycles. B. They come from the air. C. They come from the light reactions. D. They come from the sun.
Are plant and animal cells generally the same size?
a. Yes b. No, plant cells are generally larger. c. No, animal cells are generally larger.
Within bryophytes, the eggs are produced in
A. archegonia. B. tracheids. C. antheridia. D. sporangia.
How do companion cells load most of the carbohydrates into sieve tube members?
a. by symport b. through carrier proteins c. through plasmodesmata d. by antiport