Question

6 multiple choice 2 points this chart shows a list of messenger rna codons. codons in mrna first base second base third base u c a g u uuu phenylalanine ucu serine uau tyrosine ugu cysteine u uuc phenylalanine ucc serine uac tyrosine ugc cysteine c uua leucine uca serine uaa stop uga stop a uug leucine ucg serine uag stop ugg tryptophan g c cuu leucine ccu proline cau histidine cgu arginine u cuc leucine ccc proline cac histidine cgc arginine c cua leucine cca proline caa glutamine cga arginine a cug leucine ccg proline cag glutamine cgg arginine g a auu isoleucine acu threonine aau asparagine agu serine u auc isoleucine acc threonine aac asparagine agc serine c aua isoleucine aca threonine aaa lysine aga arginine a aug methionine or start acg threonine aag lysine agg arginine g g guu valine gcu alanine gau aspartic acid ggu glycine u guc valine gcc alanine gac aspartic acid ggc glycine c gua valine gca alanine gaa glutamic acid gga glycine a gug valine gcg alanine gag glutamic acid ggg glycine g a strand of dna with the sequence aac aag ccc undergoes a mutation, and the first a is changed to a c. how will this mutation affect the amino - acid sequence? all of the amino acids will change. one amino acid will change. two amino acids will change. the amino acids will remain the same.

Explanation:

Step1: Transcribe original DNA sequence

The original DNA sequence AAC AAG CCC transcribes to mRNA sequence UUG UUC GGG. Using the codon - table, UUG codes for Leucine, UUC for Phenylalanine, and GGG for Glycine.

Step2: Transcribe mutated DNA sequence

The mutated DNA sequence is CAC AAG CCC. It transcribes to mRNA sequence GUG UUC GGG. GUG codes for Valine, UUC for Phenylalanine, and GGG for Glycine.

Step3: Analyze amino - acid change

Comparing the two sets of amino - acids, only the first amino - acid changes from Leucine to Valine.

Answer:

One amino acid will change.