Inosine is found
A) in aminoacyl-tRNA synthetases.
B) in some eukaryotic elongation factors.
C) in rRNA.
D) in the third position of some codons.
E) in the third position of some anticodons.
Answer: E
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The Ames test is characterized by the use of
A) auxotrophic Salmonella typhimurium. B) heterotrophic monoploid yeast. C) autotrophic monoploid yeast. D) prototrophic Salmonella typhimurium. E) both choices A and C
The functional group that characterizes an alcohol is
A. -NH2 B. -COOH C. -PO4 D. -SH E. -OH
In natural communities, some feedback mechanisms operate whenever populations change in size. They are
1.density-dependent factors. 2.density-independent factors. 3.always within the individuals of the community. 4.always outside the individuals of the community. 5.none of the choices
In good muscle tone, how many motor units are contracted?
A. some B. all C. none D. 5-10% of the motor units E. 10-15% of the motor units