What refers to the situation in which the binding of a substrate to the enzyme causes a change in the enzyme's shape,
facilitating an enzyme's function?
a. active site
b. cofactor
c. induced fit
d. activation energy
e. allosteric inhibition
c
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Moist heat kills microorganisms by
A. irreversible denaturation of proteins. B. destruction of carbohydrates in the cell wall. C. denaturation of nucleic acids. D. dissolving the capsule.
The main phenomenon that increases the efficiency of gas exchange in fish gills is the
A. countercurrent exchange mechanism. B. co-current exchange mechanism. C. high degree of oxygen saturation of water. D. back-and-forth movement of water that maximizes oxygen uptake. E. very high blood pressure found in the circulatory system of fishes.
Arrow “B” points to a structure that
a. is one of the four exclusive features of chordates. b. extends anteriorly into the head region. c. provides support for muscle contraction. d. is replaced in adult vertebrates by the vertebral column. e. includes all of these.
Roots obtain cations through cation exchange. Which of the following do roots use to exchange for other cations from the soil?
a. Cl? b. K+ c. H+ d. H2O