Apoint mutation changes a codon in an mrna molecule. will the mutation affect the polypeptide that forms? why?
a. yes. each amino acid is specified by only one codon.
b. no. the structure of dna, and not rna, determines the polypeptide
c. maybe. some codons are translated into two or more amino acids.
d. maybe. some sets of codons are translated into the same amino acid.

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression.c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression.d-neelaredoxin is only produced when there is exposure to o2 or h2o2.