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Study Guide • Chapter

9

SCIENCE SKILLS

Interpreting D_ata

Gene Expression ..

··U

•••••••••••••••••••••••• ~-·•

~

C

A

Phenylalanine

Serine

Tyrosine

Cysteine

u

Phenylalanine

Serine

Tyrosine

Cysteine

c

Leucine

Serine

stop

stop

A

Leucine

Serine

stop

Tryptophan

G

Leucine

Proline

Histidine

Arginine

u

Leucine

Proline

Histidine·

Arginine

c

Leucine

Proline

Glutamine

Arginine

A

leucine

Proline

Glutamine

Arginine

G

Isoleucine

Threonine

Asparagine

Serine

u

Isoleucine

Threonine

Asparagine

Serine

c

Isoleucine

Threonine

Lysine

Arginine

A

Methionine

Threonine

Lysine

Arginine

G

Valine

Alanine

Aspartic acid

Glycine

u

Valine

Alanine

Aspartic acid

Glycine

c

Valine

Alanine

Glutamic acid

Glycine

A

Valine

Alanine

Glutamic acid

Glycine

G

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G·-·-''·,

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u

c-

A ~

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1. Complete the table below of DNA codons, mRNA codons, anticodons, and corresponding amino acids. Use the genetic code to assist you in completing this exercise. Remember that the genetic code is based on mRNA codons. DNA codon

GAT

mRNAcodon

UAA

Dddtryptophan

Study Guide: Chapter 9

Science Skills

149

2. Determine how the mutations in mRNA chains below will affect the amino acid sequence. Use the genetic code to complete this exercise: RNA Sequences

Amino Acid Sequences

Example: -UGU CCG· to ·UGC CCG·

Cys-Pro to Cys-Pro no change in amino acid sequence

a. ·GAA CGU- to -GAU CGU-

b. -AUC UGC- to -AUC UGG-

c. -UGU CCU CCU- to -UGU UUC CCU-

d. -GGG UUA ACC- to -GGU UAA CC-

3. What happened in mutation d? What is the result?

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I .!!

= .:

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l•

i c

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150

Study Guide: Chapter 9 Science Skills

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