The graph above shows the temperature profile for T. aquaticus polymerase, an enzyme used by a species of bacteria that
lives in hot springs. What does the boxed region indicate?
a. The enzyme activity increases as substrates increase their kinetic energy.
b. The enzyme activity decreases as substrates increase their kinetic energy.
c. The enzyme activity increases as the enzyme denatures.
d. The enzyme activity decreases as the enzyme denatures.
e. The enzyme activity decreases as the enzyme refolds.
ANSWER: d
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Answer the following statements true (T) or false (F)
1. Catabolic and anabolic reactions in living cells involve the transfer of electrons from one molecule to another in reduction-oxidation reactions. 2. Metabolism reflects only those reactions that yield energy. 3. The half-life of a molecule is the time it takes for 50% of the molecule to be broken down and recycled. 4. Autophagy is an important process that removes worn-out organelles, recycles components, then release them into the cytosol.
The principle of parsimony ____ for constructing the phylogenetic tree that represents the smallest number of
evolutionary changes.
a. minimizes the number of homologiesb. maximizes the number of homologies c. completely ignores homologies d. minimizes the number of homoplasies e. maximizes the number of homoplasies
A diploid cell has ______ the number of chomosomes as a haploid cell.
a) four times b) one-half c) twice d) one-fourth
The fluid in the sarcoplasmic reticulum contains a high concentration of ________ ions, which are released by the stimulation of an action potential
A) iron B) potassium C) phosphorus D) sodium E) calcium