Synthetic organic compounds such are chlorofluorocarbons (CFCs) are damaging to the world's fresh water supply.
a. true
b. false
Ans: b. false
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Which of the following bonds do not participate in the stabilization of double-stranded DNA as an energetically preferred structure compared with single-stranded DNA?
A. dipole-dipole interactions B. pi orbital stacking C. van der Waals interactions D. phosphodiester bonds E. hydrophobic base-stacking interactions
Viroids are characterized by all of the following except
A) circular DNA. B) well-characterized transmission. C) self-replicating. D) latent forms exist in some genomes. E) associated with plant diseases.
Bt corn is
A) adapted to resist Bt pesticides. B) grown only on no till farms. C) a variety that possesses genes from a bacterium. D) a drought tolerant form of corn.
W hat was the major stumbling block for the acceptance of natural selection as a mechanism for evolution when proposed by Darwin?
a. lack of a fossil record b. lack of observational and experimental data c. lack of a plausible theory of heredity d. lack of evidence for artificial selection