Which of the following conditions is characterized by a karyotype with 45 chromosomes?
a. Turner syndrome
b. Down syndrome
c. testicular feminization syndrome
d. Klinefelter syndrome
e. cri-du-chat
A
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The amino acids valine and threonine differ only by the presence of a hydroxyl group or a methyl group
The aminoacyl-tRNA synthetases for tRNAVal and tRNAThr must discriminate between using these two very structurally similar amino acids as substrate for creating charged tRNAs. The discrimination by the Valyl-tRNA synthetase is by differential binding of valine and/or threonine to a first site on the synthetase and, then, differential binding to a second site on the synthetase. This is an example of what known process in the specificity of tRNA synthetases? A. adenylation B. kinetic proofreading C. wobble D. premature termination E. accommodation
If a large 10-km asteroid or comet struck the Earth in the ocean floor, I. large amounts of molten rock would rain down on Earth and cause massive forest fires. II. giant tidal waves would result III. after effects would cause the deaths of most animal life on the planet. IV. thick clouds of dust would form and block out the Sun for an extended period
a. I & IV b. II & III c. I, II, & III d. I, II, III & IV e. II, III, & IV
Eukaryotic and archaeal cells are able to regulate cellular processes at which of the following levels?
A. Transcriptional B. Mutational C. Physiological D. Translational E. Posttranscriptional
Of the mollusks, snails are in the class of
A. bivalves. B. deuterostomes. C. cephalopods. D. gastropods.