How are fossils older than 60,000 years dated?
a. directly dating the fossil with carbon 14
b. directly dating the fossil with uranium 238
c. dating rock formations below the fossil
d. dating rock formations above the fossil
e. dating rock formations above and below the
fossil
E
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Which of the following statements is the best definition of a telomerase?
A. Telomerase is an enzyme that cleaves introns and exons. B. Telomerase is an enzyme that helps solve the "end replication problem." C. Telomerase is an enzyme that helps proofread and correct newly synthesized DNA. D. Telomerase is an enzyme that helps separate DNA strands.
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
Acne results when
a. bacterial secretions from hair follicles leak into internal tissues. b. bacteria that cause acne burrow into open skin wounds. c. bacterial secretions are swallowed and become systemic. d. bacterial secretions mix with sweat and become more acidic. e. bacteria are phagocytized by macrophages which then become hyperactive
Which cells produce specific antibodies?
A. Macrophages B. Monocytes C. T cells D. B cells E. Plasma cells