Normal microbiota provide protection from infection in each of the following ways EXCEPT
A) they produce antibacterial chemicals.
B) they compete with pathogens for nutrients.
C) they make the chemical environment unsuitable for nonresident bacteria.
D) they produce lysozyme.
E) they change the pH of the environment.
D
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Which of the following pairs perform essentially the same function in cells?
A. aquaporins and contractile vacuoles B. plasma membranes and cell walls C. turgor pressure and proton pumps D. electrochemical gradient and osmosis
If the concentration of thyroid hormone is
high,
a. the secretion of thyroid-releasing hormone is inhibited. b. the secretion of thyroid stimulating hormone is increased. c. calcitonin production is increased. d. resting metabolism decreases. e. more than one of these occurs
Frameshift mutations result from:a
the substitution of one base pair for another. b. the substitution of more than one base pair. c. the insertion or deletion of one or two base pairs. d. the substitution of a stop codon for an amino acid-specifying codon. e. the substitution of a start codon for an amino acid codon.
If you consider a DNA molecule to resemble a twisted ladder, the rungs of the ladder are paired nitrogen bases
__________________ Indicate whether the statement is true or false.