A covalent bond is formed when:
A) two atoms share electrons.
B) one atom gives up electrons to another atom.
C) two nonpolar molecules associate with each other in a polar environment.
D) two polar molecules associate with each other in a nonpolar environment.
E) a positively charged particle is attracted to negatively charged particle.
A) two atoms share electrons.
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The promotion of the lactose operon in
bacteria is a. activated by a repressor protein. b. independent of glucose concentration. c. activated by t lactose binding. d. regulated by RNA polymerase. e. none of these
Inbreeding is less likely to produce offspring that are homozygous for a harmful recessive trait.
a. true b. false
The conservation organization TAMAR has had some success in protecting sea turtles by
A) making beautiful jewelry from turtle shells. B) lobbying for legislation that supports the cause. C) engaging the local community in conservation efforts. D) increasing the market for turtle eggs. E) fundraising in wealthy countries.
The prevalence of a particular disease refers to:
A) the frequency with which the disease occurs. B) how acutely the disease negatively affects a person. C) the number of cases in a particular population over time. D) the number of deaths from the disease in a given population.