A mutant protein has been designated as G189A. What does this designation reveal about the mutation?

A. That a G nucleotide has been exchanged for an A nucleotide 189 bases from the 5' end of the coding region.
B. That a glycine in position 189 of the protein is now an alanine.
C. That an A nucleotide has been exchanged for a G nucleotide 189 bases from the 5' end of the coding region.
D. That a glycine is now in position 189 of the protein instead of an alanine.
E. That a nonsense mutation occurred at position 189 of the protein.


B

Biology & Microbiology

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Many eukaryotes have a DNA glycosylase that specifically removes T residues from DNA when paired with G. Why is it better to repair the G-T pairing to G-C by removing the T than to remove the G and form an A-T pair?

A. G-C pairs can form three hydrogen bonds between them and are therefore stronger. B. Oxidative damage to guanine by alkylation is the most common reason for G-T pairs, so removal of the T will maintain the original G-C pair. C. T bases easily tautomerize into C bases, so removing the T will make sure the pair stays in its original form. D. G-C basepairs occur more frequently in cells. E. All of the choices provided are potential reasons.

Biology & Microbiology

DNA microassays:

A. can reveal protein-protein interactions. B. demonstrate differential expression of genes. C. can reveal protein-RNA interactions. D. can be used to purify proteins that bind to epitope tags. E. are somewhat large and unwieldy but give a great deal of information.

Biology & Microbiology

Lister developed his ideas on prevention of infection during medical procedures after studying the work of

A. Koch. B. Pasteur. C. Jenner. D. Fleming.

Biology & Microbiology

Which of the following infects only plants?

A. Virus B. Prion C. Viroid D. Capsid

Biology & Microbiology