The tapetum lucidum is a key adaptation for
A. visual function in brightly lit shallow marine waters.
B. visual sensitivity in nocturnally active animals.
C. visual function in prey species that require wide fields of vision.
D. visual function in the deep sea.
E. visual function in fast moving predators.
Answer: B
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A) a membrane-enclosed nucleus B) mitochondria C) the endoplasmic reticulum D) the nucleoid E) ribosomes Answer: D
Cats cannot synthesize the amino acid taurine. This means that in cats, taurine
A. is not a required nutrient. B. is an essential amino acid. C. is a nonessential amino acid. D. must be stored in cellular compartments. E. is not present in their normal diet.
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Changes at the molecular level can turn proto-oncogenes into oncogenes. These changes cause unregulated cell division. Which disease is caused by this transformation?
A. diabetes B. leukemia C. pneumonia D. hemophilia