Question

a codon is a set of three nucleotides that correspond to a specific amino - acid. the table below shows various dna codons and their corresponding amino acids.

amino acid	dna codon(s)
arginine	aga, agg, cgt, cgc, cga, cgg
asparagine	aat, aac
aspartic acid	gat, gac
cysteine	tgt, tgc
glutamic acid	gaa, gag
glutamine	caa, cag
glycine	ggt, ggc, gga, ggg
histidine	cat, cac
isoleucine	att, atc, ata
leucine	ctt, ctc, cta, ctg, tta, ttg
lysine	aaa, aag
methionine (start)	atg
phenylalanine	ttt, ttc
proline	cct, ccc, cca, ccg
serine	tct, tcc, tca, tcg, agt, agc
threonine	act, acc, aca, acg
tryptophan	tgg
tyrosine	tat, tac
valine	gtt, gtc, gta, gtg
stop	taa, tag, tga

1. in the dna strand below, two nucleotides were reversed during replication.

original dna strand: atgatt
incorrect copy of dna strand: aigiat

what will happen when the replicated dna strand is translated into a protein?
a. the same amino - acid, isoleucine, will be added
b. no amino acids will be added at all
c. nothing will happen
d. tyrosine will be added instead of isoleucine

Explanation:

Step1: Identify original codon

The original DNA strand has the codon ATT which codes for isoleucine.

Step2: Identify new codon

The incorrect copy has the codon ATA which also codes for isoleucine according to the provided table.

Answer:

A. The same amino - acid, isoleucine, will be added