Question

Which codon is the code for the amino acid histidine (His)

Messenger

Second base in codon

RNA Codons

U

С

A

G

UUU UCU

Phel

UAU UGU U

UUC)

UCC UAC)

Tyr

U

UGC)

Cys

Ser

C

UUA UCA

Leu

UAA Stop UGA Stop A

UUG

UCG

UAG Stop UGG Trp G

CUU CCU

CAU

U

CGU

CUC ССС

His

CAC) CGC

Leu Pro

с

CCA

Arg

CAA1

CUG

CGA

Gin

CCG CAG CGG

AUU ACU

AAU

AUC)lle ACC

Asn Ser

AAC) AGC

Thr

AUA

ACA AAA

AUG Start Me ACG

AGA

Lys Arg

AAG AGG

GUU GCU GAU1 GGU

GUC GCC

Asp

GAC) GGC

G

Val

Ala

GUA

GCA

Gly

GAA

Glu

GGA

GUG

GCG GAG) GGG

First base in codon

CUA

Third base in codon

AGU

A. CAA

B. UAC

Ο Ο Ο Ο

C. AAC

D. CAU

Answer 1

The codon that codes for the amino acid histidine (His) is CAC. Therefore, the correct answer is D. CAU.