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NCDPI

North Carolina Test of Biology. Form I RELEASED Fall 2009

7.

This chart represents amino acids that are coded from different combinations of mRNA codons.

RELEASED

A

Valine — Isoleucine — Glycine

B

Valine — Aspartic Acid — Alanine

C

Valine — Isoleucine — Alanine

D

Valine — Phenylalanine — Alanine

Which amino acid sequence can be coded from the DNA sequence CAG TAG CGA?

First

Second

Third

Base

Base

Base

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

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

Codons in mRNA

U

U

C

A

G

C

U C A G U C A G

Serine Serine Arginine Arginine Glycine Glycine Glycine Glycine

AGU AGC AGA AGG GGU GGC GGA GGG

A

G

AUG Methionine or start GUU GUC GUA GUG Valine Valine Valine Valine

AUU

Isoleucine

AUC

Isoleucine

AUA

Isoleucine

ACU Threonine AAU ACC Threonine AAC ACA Threonine AAA ACG Threonine AAG

Asparagine Asparagine Lysine Lysine

GAU Aspartic Acid GAC Aspartic Acid GAA Glutamic Acid GAG Glutamic Acid

GCU

Alanine

GCC

Alanine

GCA

Alanine

GCG

Alanine

Page 5

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