Which of the following types of animal virus requires RNA-dependent RNA transcriptase to be replicated?
A) +ssRNA viruses
B) ssDNA viruses
C) -ssRNA viruses
D) retroviruses
E) dsDNA viruses
C
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Which of the following correctly indicates the complementary base pairing of adenine in DNA and RNA?
A. adenine with thymine in both DNA and RNA B. adenine with uracil in DNA and with thymine in DNA C. adenine with thymine in DNA and with uracil in RNA D. adenine with cytosine in DNA and with guanine in RNA E. adenine with guanine in DNA and with cytosine in RNA
Which function is most likely controlled primarily by the gray-matter centers in the brain stem?
a. vomiting b. learning c. patellar tendon reflex d. writing
e. pain recognitionThese bacteria can live in water of very high salt concentration.
Squids and octopuses move by means of water movement through their
A. cilia and flagella. B. muscular foot. C. modified mantle cavity. D. tentacles. E. radula.