Dogs have a diploid chromosome number of 78 . How many chromosomes do their gametes have?
a. 26
b. 39
c. 78
d. 156
e. 234
b
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Aminoacyl-tRNA synthetases catalyze covalent addition of ________ to tRNAs.
Fill in the blank(s) with the appropriate word(s).
Which sequence of events CORRECTLY describes the initiation and elongation steps of translation in prokaryotic cells?
(1) initiator tRNA binds start codon on mRNA (2) small ribosomal subunit binds to mRNA (3) large ribosomal subunit binds (4) tRNA entry and peptidyl transfer reaction (5) translocation of ribosome and release of tRNA A. 1, 2, 3, 4, 5 B. 1, 2, 3, 5, 4 C. 1, 3, 2, 4, 5 D. 2, 3, 1, 5, 4 E. 2, 1, 3, 4, 5
Which mutation in DNA would lead to the change of a single amino acid in a protein?
A. a frameshift B. a missense mutation C. a nonsense mutation D. one base insertion E. one base deletion
Using the analogy of a 12-hour geologic time clock
a. prokaryotes appear shortly after 5 a.m. b. eukaryotes appear at 9 a.m. c. dinosaurs appear at 10 a.m. d. early fishes appear at 11 a.m. e. the first humans appear at 11:59 a.m.