The alleles of a gene are found at ________ chromosomes
A) the same locus on nonhomologous
B) different loci on homologous
C) different loci on nonhomologous
D) the same locus on homologous
Answer: D
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Insertion sequences:
A. contain one or more genes (such as antibiotic resistance genes) in addition to those needed for transposition. B. are simple transposons that contain only the sequences required for transposition. C. are simple transposons that contain only the sequences required for transposition and the gene encoding the transposon. D. contain auxiliary genes that activate the transposase. E. None of the choices given describes insertion sequences.
Allof the following evidence supports the RNA world hypothesisexcept:
A. RNA can function as a genome. B. An RNA component of ribosomes catalyzes the synthesis of proteins. C. RNA can serve a structural role. D. RNA stabilizes membranes. E. RNA regulates gene expression.
The accompanying figure illustrates that after two half-lives, ____ percent of the parent radioisotope has decayed
a. 100 b. 75 c. 50
d. 25 e. 0
The sum of all chemical reactions that occur in a cell is called
a. catabolism. b. anabolism. c. metabolism d. oxidation/reduction.