If a mutagenesis screen provides some number (e.g., 24 ) of alleles shown by complementation analysis to be in the same gene, which of the following is true?
A) These mutants can be used to identify the role of the gene in metabolism.
B) The gene being studied must be present in more than one copy per haploid genome.
C) The gene, in whole or in part, must be involved in transformation.
D) The gene must be highly conserved in evolution.
E) The gene must be involved in regulating a signal pathway.
A
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In nitrification, electrons are donated to an electron transport chain from ammonia or from nitrite to be oxidized to ________, with ________ serving as the terminal electron acceptor.
Fill in the blank(s) with the appropriate word(s).
You identify an enzyme involved in a cellular reaction. How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?
A. The reaction equilibrium is unaffected, but it lengthens the time needed to reach equilibrium. B. The reaction equilibrium is unaffected, but it shortens the time needed to reach equilibrium. C. It alters the reaction equilibrium and shortens the time needed to reach equilibrium. D. It alters the reaction equilibrium and lengthens the time needed to reach equilibrium.
Organisms use carbohydrates in all of the following ways EXCEPT
A) as a component of cell walls. B) as a long-term energy source. C) as a short-term energy source. D) to keep membranes flexible at low temperatures. E) as a building block of DNA and RNA molecules.
Based upon the identification of 12 species of Galápagos finches, Charles Darwin hypothesized that the finches were not closely related.
a. true b. false