15. When an atom or molecule loses one or more electrons, it is said to be: A. energized. B. oxidized. C. polarized. D. reduced. 16. A drug binds to the active site of an enzyme. If it is bound to the active site of the enzyme, it prevents substrate binding. This drug would be considered a(n) A. noncompetitive inhibitor. B. allosteric inhibitor. C. allosteric activator. D. competitive inhibitor. 17. If the AG of a reaction was +31.45 kJoules, which of the following is NOT true regarding this reaction? A. the products have more free energy than the reactants B. the reaction requires an energy input of 31.45 kJoules to proceed. C. The reaction is exergonic D. The reaction is endergonic 18. The large number of alveoli in lungs improve gas exchange by A. decreasing the distance for diffusion B. increasing the surface area for diffusion C. increasing the concentration difference D. changing the diffusion constant 19. Exchange of gases and metabolites between the blood and tissues occurs in the A. arteries. B. arterioles. C. capillaries. D. venules. 20. One mechanism that some animals use to limit heat loss in cold environments is: A. vasodilation of the near surface blood vessels. B. vasodilation of below surface blood vessels. C. vasoconstriction of the precapillary sphincters in the skin. D. vasodilation of veins.
15. When an atom or molecule loses one or more electrons, it is said to be: A. energized. B. oxidized. C. polarized. D. reduced. 16. A drug binds to the active site of an enzyme. If it is bound to the active site of the enzyme, it prevents substrate binding. This drug would be considered a(n) A. noncompetitive inhibitor. B. allosteric inhibitor. C. allosteric activator. D. competitive inhibitor. 17. If the AG of a reaction was +31.45 kJoules, which of the following is NOT true regarding this reaction? A. the products have more free energy than the reactants B. the reaction requires an energy input of 31.45 kJoules to proceed. C. The reaction is exergonic D. The reaction is endergonic 18. The large number of alveoli in lungs improve gas exchange by A. decreasing the distance for diffusion B. increasing the surface area for diffusion C. increasing the concentration difference D. changing the diffusion constant 19. Exchange of gases and metabolites between the blood and tissues occurs in the A. arteries. B. arterioles. C. capillaries. D. venules. 20. One mechanism that some animals use to limit heat loss in cold environments is: A. vasodilation of the near surface blood vessels. B. vasodilation of below surface blood vessels. C. vasoconstriction of the precapillary sphincters in the skin. D. vasodilation of veins.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Enzyme kinetics
In biochemistry, enzymes are proteins that act as biological catalysts. Catalysis is the addition of a catalyst to a chemical reaction to speed up the pace of the reaction. Catalysis can be categorized as either homogeneous or heterogeneous, depending on whether the catalysts are distributed in the same phase as that of the reactants. Enzymes are an essential part of the cell because, without them, many organic processes would slow down and thus will affect the processes that are important for cell survival and sustenance.
Regulation of Enzymes
A substance that acts as a catalyst to regulate the reaction rate in the living organism's metabolic pathways without itself getting altered is an enzyme. Most of the biological reactions and metabolic pathways in the living systems are carried out by enzymes. They are specific for their works and work in particular conditions. It maintains the best possible rate of reaction in the most stable state. The enzymes have distinct properties as they can proceed with the reaction in any direction, their particular binding sites, pH specificity, temperature specificity required in very few amounts.
Question
Transcribed Image Text:15. When an atom or molecule loses one or more electrons, it is said to be:
A. energized.
B. oxidized.
C. polarized.
D. reduced.
16. A drug binds to the active site of an enzyme. If it is bound to the active site of the
enzyme, it prevents substrate binding. This drug would be considered a(n)
A. noncompetitive inhibitor.
B. allosteric inhibitor.
C. allosteric activator.
D. competitive inhibitor.
17. If the AG of a reaction was +31.45 kJoules, which of the following is NOT true
regarding this reaction?
A. the products have more free energy than the reactants
B. the reaction requires an energy input of 31.45 kJoules to proceed.
C. The reaction is exergonic
D. The reaction is endergonic
18. The large number of alveoli in lungs improve gas exchange by
A. decreasing the distance for diffusion
B. increasing the surface area for diffusion
C. increasing the concentration difference
D. changing the diffusion constant
19. Exchange of gases and metabolites between the blood and tissues occurs in the
A. arteries.
B. arterioles.
C. capillaries.
D. venules.
20. One mechanism that some animals use to limit heat loss in cold environments is:
A. vasodilation of the near surface blood vessels.
B. vasodilation of below surface blood vessels.
C. vasoconstriction of the precapillary sphincters in the skin.
D. vasodilation of veins.
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