Question

question 2 of 10 a part of an mrna has the base sequence gca. which change to this sequence would indicate a missense mutation? messenger rna codons first base in codon second base in codon third base in codon u c a g u uuu uuc phe ucu ucc uca ucg ser uau uac tyr ugu ugc cys u c uua uug leu uaa stop uag stop uga stop ugg trp a g c cuu cuc cua cug leu ccu ccc cca ccg pro cau cac his cgu cgc arg u c caa cag gln cga cgg a g a auu auc aua ile acu acc aca acg thr aau aac asn agu agc ser u c aaa aag lys aga agg arg a g g guu guc gua gug val gcu gcc gca gcg ala gau gac asp ggu ggc gly u c gaa gag glu gga ggg a g a. gaa b. gcc

Explanation:

A missense mutation is a point - mutation where a single nucleotide change results in a codon that codes for a different amino acid. The original codon GCA codes for alanine. GAA codes for glutamic acid, GCC still codes for alanine. A change to GAA would change the amino - acid specified, indicating a missense mutation.

Answer:

A. GAA