A protein molecule, transferrin, embedded in the plasma membrane recognizes iron molecules and causes the plasma membrane to fold in around the iron and take it into the cell. This is an example of
a. osmosis.
b. diffusion.
c. receptor-mediated endocytosis.
d. pinocytosis.
Answer: c. receptor-mediated endocytosis.
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What stage of mitosis is essentially the reverse of prophase?
A. Anaphase B. Prometaphase C. Metaphase D. Telophase E. Cytokinesis
Dissolved oxygen would be expected to be highest in which of these bodies of water?
a. warm eutrophic lake b. slow-moving tropical river c. pool within a cool forest stream d. white water stretch of a cold river e. dissolved oxygen should be the same in all waters
Which stage is the only diploid stage in the zygote fungus life cycle?
A. Gametangia B. Mycelium C. Immature zygospore D. Spores E. Zygote
During which phase of the cell cycle do the chromosomes align in one plane at the center of the cell?
A) interphase B) prophase C) metaphase D) anaphase E) telophase