Cytochromes contain a heme group similar to that in hemoglobin. The iron atom (Fe) in the center of the group can be oxidized and reduced. If someone was suffering from iron deficiency anemia, what stage of cellular respiration would be most affected?
A. glycolysis
B. the electron transport chain
C. fermentation
D. the Krebs cycle
Answer: B
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Plasmids often encode for proteins
A) involved in translation. B) required for cellular growth. C) that confer resistance to antibiotics. D) involved in DNA replication.
Which of the following statements about the angiosperm embryo sac is FALSE?
A. It contains eight nuclei. B. It is the gametophyte generation of the plant. C. The nuclei within the embryo sac are diploid. D. The synergids flank the egg cell. E. The embryo sac nuclei are the product of mitotic division of a megaspore.
The seasonal cessation of activities accompanied by a reduction in metabolism in response to cold temperatures during winter is called
A) hibernation. B) torpor. C) heterothermy. D) diapause.
Immediately after an action potential occurs, the sodium channels close and cannot be reopened. What is this period called?
What will be an ideal response?