Once the body becomes adapted to drugs, it takes
even greater exposure to that drug to achieve the
same level of reaction. This condition is known as
a. synergism.
b. habituation.
c. psychological dependence.
d. tolerance.
e. concealment.
Answer: d
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Carrier-mediated transport is also called
A. facilitated diffusion. B. active transport. C. exocytosis. D. endocytosis. E. phagocytosis.
Which one of the following statements about the incorporation of selenocysteine into proteins is true?
A. Selenocysteine is an example of a posttranslational modification. B. The tRNA used to translate selenocysteine at a stop codon is first charged with serine. C. The tRNA used to translate selenocysteine at a stop codon has an anticodon sequence of UGA. D. The serine bound to the tRNA used to translate selenocysteine at a stop codon is converted to selenocysteine by the enzyme SelB.
In sickle cell anemia, affected individuals carry ____
a. one of several different nucleotide substitutions b. the same single nucleotide substitution c. more than one nucleotide substitution d. a number of mutant alleles e. one mutant allele in several genes
Cuticle, guard cells, stomata, and trichomes are all terms associated with ____
a. ground tissue b. vascular tissue c. meristem d. dermal tissue e. secondary tissue