How do small polar and charged molecules typically cross the cell membrane?
a. by facilitated diffusion
b. by osmosis
c. by active transport
d. by filtration
Ans: a. by facilitated diffusion
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A biologist discovered a new animal. Upon studying its embryonic development, she observed radial cleavage with the blastopore developing into an anus. This animal was categorized as a
A. parazoan. B. radiata. C. deuterostome. D. protostome. E. pseudocoelomate.
The structure that people typically refer to as a
"mushroom" is technically called the a. basidiocarp. b. mycelium. c. ascocarp. d. hyphal mass. e. zygospore.
Which of the following statements about digestion is true?
A) Digestion occurs only in the stomach. B) Digestion can be both mechanical and chemical, and it occurs both in the mouth and in the stomach. C) Mechanical digestion occurs only in the stomach; chemical digestion occurs only in the mouth. D) Digestion is the same thing as ingestion.
What activity involves dragging huge nets weighted down with chains and steel plates over the ocean floor to harvest a few species of bottom fish and shellfish?