Plasmodesmata are considered part of the
a. symplastic pathway.
b. transmembrane and symplastic pathways.
c. transmembrane pathway.
d. apoplastic, transmembrane, and symplastic pathways.
e. apoplastic pathway.
A
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Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open. B. while the proteins are being assembled. C. after the cell is dead. D. while the DNA is being copied into RNA. E. during cell division.
When comparing chick and pig embryos, the similar eyes, pharyngeal pouches, and postanal tails are evidence of
A. artificial selection. B. biogeography. C. analogy. D. Common ancestry E. convergent evolution.
Which of the following neurotransmitters is associated with sleep, mood, attention, and learning?
A) acetylcholine B) epinephrine C) serotonin D) endorphins
The mucus-producing cells that line the stomach
A) increase the surface area of the stomach for faster digestion. B) stimulate production of hydrochloric acid. C) lubricate and protect the stomach lining. D) move food upward in the stomach to prolong digestion.