Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 6, Problem 4TY
Researchers analyzed a cell extract—a mixture of molecules isolated from a certain type of cell—and studied a
When they added a protease to the cell extract, they discovered that the protease greatly inhibited the
- a. exergonic.
- b. endergonic.
- c. catalyzed by an enzyme.
- d. catalyzed by a ribozyme.
- e. Both b and c are true of this reaction.
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Penicillin functions by inhibiting an enzyme, transpeptidase, that catalyzes the last step in the bacteria's metabolism which synthesises bacterial the cell-wall.
Why does inhibition of this enzyme make Penicilin such an effective medicine in humans, with so few side effects?
A. Inhibiting enzymes like this always slows the metabolism of an organism.
B. The enzyme is not inhibited in humans because we have resistance to the penicillin.
C. The enzyme is part of an essential pathway in the bacteria, which does not exist in humans.
D. Inhibiting the enzymes stops respiration in the bacteria, killing quickly.
Researchers analyzed a cell extract—a mixture of molecules isolatedfrom cells—and studied a chemical reaction in which a carbohydratewas broken down into smaller molecules. When they added a proteaseto the cell extract, they discovered that the protease greatly inhibited therate of the reaction. Based on this observation, you could conclude thatthe reaction isa. exergonic.b. endergonic.c. catalyzed by an enzyme.d. catalyzed by a ribozyme.e. Both b and c are true of this reaction.
How could you use the diversity of metabolic pathways that produce the same or similar products to critique this argument?
Rank the steps from first to last.
a. New enzymes cause modification of the pathway in an advantageous way. b. The biochemical pathway is gradually modified. c. A pathway exists and accomplishes some functions. d. An organism with cellular enzymes has mutations that allow new enzymes to arise.
Chapter 6 Solutions
Biology
Ch. 6.1 - Which do you think has more entropy, a NaCl...Ch. 6.1 - Prob. 2CCCh. 6.2 - Prob. 1CCCh. 6.2 - Prob. 2CCCh. 6.2 - Prob. 1CSCh. 6.2 - Prob. 1EQCh. 6.2 - Prob. 2EQCh. 6.2 - Prob. 3EQCh. 6.3 - Prob. 1CSCh. 6.3 - Prob. 2CS
Ch. 6.4 - What are advantages of protein degradation?Ch. 6 - Reactions that release free energy are a....Ch. 6 - Enzymes speed up reactions by a. providing...Ch. 6 - Prob. 3TYCh. 6 - Researchers analyzed a cell extracta mixture of...Ch. 6 - In biological systems, ATP functions by a....Ch. 6 - In a chemical reaction, NADH is converted to NAD+...Ch. 6 - Prob. 7TYCh. 6 - Prob. 8TYCh. 6 - Prob. 9TYCh. 6 - Autophagy provides a way for cells to a. degrade...Ch. 6 - Prob. 1CQCh. 6 - Prob. 2CQCh. 6 - Prob. 3CQCh. 6 - Prob. 1COQCh. 6 - Prob. 2COQ
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- Which of the following best explains why enzyme catalysis is affected by a change in pH? A. Change in pH alters ionization states of serine in the active site involved in nucleophilic catalysis B. The ionization states of his, asp and glu involved in acid/base catalysis are altered with change in pH C. Change in pH alters ionization states of contact amino acids in the active site D. All enzymes have optimum pHarrow_forwardWhich of the following describes a reaction that requires substrate 1 to bind the the enzyme, then substrate 2 binds, and then the products are produced? A. No ternary complex B. Ordered ternary complex C. Ping-Pong D. Random ternary complexarrow_forwardYou are studying Protein X, which is a tetramer whose function is to bind glucose. You have found a molecule that is an allosteric effector of the protein’s activity. This means that: a. The molecule causes Protein X to bind O2 very tightly b. The molecule does not bind in the active site but affects the function of the protein c. The molecule is highly negatively charged d. The molecule binds in the same site as glucosearrow_forward
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