Groups of three consecutive bases along the DNA of a gene have the code for one
A. nucleotide.
B. protein.
C. purine.
D. amino acid.
Answer: D
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During the production of beer, the barley must be “malted,” which means it is
a. converted to simple sugars. b. exposed to baker’s yeast. c. exposed to brewer’s yeast. d. fermented.
Microparasites are usually characterized by
A) a large body size. B) a long generation time. C) a long time of infection relative to the host's expected life span. D) direct transmission from one host to another.
Why can shorter wavelengths NOT be used by pigments?
a. They would oxidize the pigment. b. They would reduce the pigment. c. They would cause the excitation of electrons. d. They would cause electrons to gain insufficient energy.
Which of the following morphological innovations is found in the ancestor that led to vertebrates?
a. the notochord b. vertebrae c. bone d. neural crest cells