A researcher who detects a higher-than-normal amount of interferon in a laboratory rat would correctly conclude that
A) the rat has, or recently had, a viral infection.
B) cancerous cells are present in the rat.
C) the rat's diet is deficient in calcium.
D) monocytes are differentiating into macrophages in the rat's bloodstream.
Answer: A
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Blood entering the heart from the body passes through the heart chambers and lungs in the following order:
A. right atrium, right ventricle, lungs, left atrium, left ventricle. B. left atrium, left ventricle, lungs, right atrium, right ventricle. C. right atrium, left atrium, lungs, right ventricle, left ventricle. D. left atrium, right atrium, lungs, left ventricle, right ventricle. E. right ventricle, left ventricle, lungs, left atrium, right atrium.
If bacteria living in salty seawater were displaced to a freshwater environment, the cell structure that would prevent the cells from rupturing is the ________.
A. capsule B. cell membrane C. endospore D. cell wall E. slime layer
The endosymbiotic theory explains the origins of which of the following components of a eukaryotic cell?
a. mitochondria b. chloroplasts c. internal membranes d. All of these are correct.
Which of the following is true of vitamins?
A) They serve as a major energy source for cells. B) They can serve as enzymes. C) They can serve as coenzymes. D) They are the main component of enzymes.