Which interaction is not involved in maintaining tertiary structure in protein molecules?
A) covalent bonds
B) hydrogen bonds
C) hydrophobic interactions
D) electrostatic interactions
E) All of the choices may be involved in maintaining tertiary structure in proteins.
E) All of the choices may be involved in maintaining tertiary structure in proteins.
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A human fetus that has the genotype XO will be designated female because:
A. female sex is determined by the presence of a gene on the X chromosome. B. female sex is determined by the absence of TDF, a protein produced by a gene on the fetus's Y chromosome. C. female sex is determined by only one X chromosome. D. female sex is determined by the presence of TDF, a protein produced by a gene on the fetus's X chromosome.
A diagnosis of tuberculosis involves a/an ________.
A. tuberculin skin test B. sputum culture C. chest X ray D. acid-fast stain of sputum E. All of the choices are correct.
You are a NASA scientist and have discovered an organism in outer space that contains its genetic material in the cytoplasm rather than in a nucleus. Given this characteristic, how might you classify this organism?
A. Eukaryote B. Prokaryote C. Heterotroph D. Autotroph
Which class of RNA is required for DNA transcription?
A) mRNA B) tRNA C) rRNA D) all of the choices