A group of similar cells that perform a particular function is called.
a) an organ system
b) an organ
c) an organism
d) a tissue
Answer: d) a tissue
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Oxytocin and cholecystokinin are transported through the bloodstream and arrive at the uterus at the same time. Oxytocin causes the uterus to contract, whereas cholecystokinin has no effect. Why?
A. The uterus has receptors for oxytocin, but not for cholecystokinin. B. Oxytocin blocks the activity of cholecystokinin. C. Oxytocin alters gene expression patterns, whereas cholecystokinin does not. D. Oxytocin is able to diffuse through the plasma membrane of uterine cells, whereas cholecystokinin cannot. E. Oxytocin is at a higher concentration in the bloodstream than cholecystokinin.
The TCA cycle and glyoxylate cycle are similar in many respects. Which of the following statements accurately describes these cycles?
A) Both cycles are catabolic in function. B) The glyoxylate cycle has only a single decarboxylating reaction. C) In the glyoxylate cycle, two acetyl CoA molecules are used to generate succinate. D) The glyoxylate cycle is used by some organisms to synthesize proteins. E) The TCA and glyoxylate cycles both occur in the mitochondrion
Mutations are the original source of new alleles, but many are __________ or __________. Fill in the blank(s) with the appropriate word(s)
Rabies is caused by a
A) bacterium. B) prion. C) virus. D) viroid. E) fungus.