The carcinogenic chemicals found in greatest concentration in foods are ____
a. heavy metals
b. alcohols
c. PVCs
d. pesticides
e. PCBs
ANSWER: d
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What would result from a single nucleotide deletion (point mutation) within the coding sequence of a structural gene?
A. a silent point mutation with no deleterious effects B. a missense point mutation resulting in the change of one amino acid C. a nonsense point mutation resulting in the generation of a premature stop codon D. a frameshift mutation, producing a different amino acid sequence altogether E. All of the choices are possible.
When sodium chloride is dissolved in water, it dissociates to form ______ ______ and ______ ______.
Fill in the blank(s) with the appropriate word(s).
All of these are similarities between the male and female system EXCEPT one. Choose the exception
A) Both have erectile tissue that becomes engorged with blood during sexual excitement. B) Both have paired gamete-producing organs. C) Both have a urethra that carries both urine and gametes. D) Both have a pair of tubes that can carry gametes.
The phase of a population growth curve that comes after the lag phase is the
A. stable equilibrium phase. B. deceleration phase. C. exponential growth phase. D. death phase.