Which of the following animals has an
exoskeleton?
a. leeches
b. frogs
c. crabs
d. roundworms
e. more than one of these animals has an
exoskeleton
C
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In the crystal matrix of ordinary salt, the sodium and chlorine are held together by:
A. peptide bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds. E. nonpolar bonds.
In the picture below, how many chromosomes are present?
A. 92 B. 22 C. 46 D. 23
A molecule that closely resembles the shape of a substrate for an enzyme and that decreases the activity of the enzyme would most likely serve as a(n)
A. noncompetitive inhibitor. B. allosteric inhibitor. C. allosteric activator. D. competitive inhibitor.
The reason segmental duplications pose a logistical challenge in the proper alignment of DNA sequences is that they
A. contain large numbers of LINEs, which interfere with sequence annotation. B. are inherently repetitive. C. interfere with BLAST analysis. D. are often found in areas of constitutive heterochromatin.