The half-life of carbon-14 is 5730 years. Approximately how old is a fossil that contains .25g carbon-14 and .75g nitrogen-14?
A. 11,460 years
B. 5730 years
C. 17,190 years
D. 22,920 years
E. 28650 years
A
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The spread of cancer cells from one site to
others in the body is known as
a. abiogenesis. b. metastasis. c. benign transfer. d. neoplastic movement. e. mutational slippage
Four of the five answers listed below are
heterotrophic. Select the EXCEPTION.
a. consumers b. carnivores c. herbivores d. parasites e. producers
The innermost portion of a virus's structure is made up of
A. a membranous envelope. B. either DNA or RNA. C. both DNA and RNA. D. microtubules. E. a protein capsid.
Which of the following does NOT lead to development of penicillin resistance?
a) acquisition of a beta-lactamase gene b) direct binding to the bacterial ribosome c) loss of transpeptidase affinity for penicillin d) a modification in the cell wall that blocks penicillin entry