Which of the following is found in nucleic acids?
A. amines
B. carboxylic acid
C. purines
D. glycerol
E. R group
Answer: C
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The side group (R group) of the amino acid shown above contains which of the following functional
groups?
a. hydroxyl b. carbonyl c. carboxyl d. sulfhydryl e. amino
The preeminent American naturalist of the late 1800s was
a. Charles Darwin. b. Charles Wyville Thomson. c. Victor Hensen. d. Alexander Agassiz. e. Edward Forbes.
In animals, a sphere of embryonic cells surrounding a fluid-filled cavity is called a
A. coelom. B. blastula. C. gastrula. D. hydrostatic skeleton. E. gastrovascular cavity
Crossing-over occurs between
a. sister chromatids of the same chromosome. b. chromatids of nonhomologous chromosomes. c. nonsister chromatids of a homologous pair. d. None of these are correct.