Altering the three-dimensional structure of an enzyme might
A. change the type of substrate that binds the enzyme's active site.
B. prevent the substrate from binding the enzyme's active site.
C. change the type of product produced in the reaction.
D. change the amount of energy needed for a reaction.
E. prevent the enzyme from adding energy to a reaction.
B. prevent the substrate from binding the enzyme's active site.
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Determine the rate of diffusion in the gas-exchange organ of an air-breathing animal where the area for gas exchange in the lung is 200 mm2,
the diffusion constant is 0.08, the (partial pressure of oxygen) of the air in the lung is 140 mm Hg, the in blood flowing into the lung is 90 mmHg, and the thickness of the gas exchange membrane is 0.001 mm. A) 800,000 B) 125 C) 00032 D) 10,000,000
The individualistic model of a community as an assemblage coexisting primarily of species similar in their physiological requirements was proposed by
A. Frederic Clements. B. Charles Darwin. C. Henry Allan Gleason. D. David Tilman. E. Joseph Connell.
The short nucleotide sequence that base-pairs with any complementary sequences in DNA during PCR is a(n) ____
a. primer b. exon c. intron d. restriction enzyme e. polysome
Amoeboid protozoans
A) may exist in the environment encased in a tough protective layer called a cyst. B) move via cilia. C) are always free-living. D) move via cilia and are always free-living. E) move via cilia, are always free-living and may exist in the environment encased in a tough protective layer called a cyst.