What enzyme protects the linings of internal tubes from bacteria?
a. lactic acid
b. complement
c. cytokine
d. mucus
e. lysozyme
e
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An experimenter has altered the end of the tRNA corresponding to the amino acid methionine in such a way as to remove the bases AC. Which of the following hypotheses describes the most likely result?
A) tRNA will not form a cloverleaf. B) The amino acid methionine will not become covalently bound. C) The anticodon will not bind with the mRNA codon. D) The aminoacyl-tRNA synthetase will not be formed.
Jacques Monod spoke of the "postulate of objectivity," which assumes that forces and phenomena in nature:
A. are not consistent. B. cannot be predicted. C. follow consistent rules. D. often create different outcomes.
On MacConkey agar, Serratia spp. would appear:
a. red. b. colorless. c. green. d. yellow.
Rett syndrome results from
A) a microRNA that binds the wrong set of mRNA targets. B) unstable transposons. C) fetal hemoglobin that is reactivated in a child. D) abnormal methylation of a gene expressed in the brain.