An Amino Acid Substitution Can Result in a Large Change

question 43

Multiple Choice

An amino acid substitution can result in a large change in secondary and tertiary structure.Sometimes, the substitution leads to very little change.The structure of valine is shown below.Which amino acid would probably cause the least amount of perturbation to protein structure if it was substituted for a valine?

• A) amino acid a
• B) amino acid b
• C) amino acid c
• D) amino acid d
• E) amino acid e

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Definitions:

Vesicles

Small cavities in volcanic rocks that are formed by gas bubbles trapped during the solidification of the rock.

Shield Volcanoes

Large, broad volcanoes with gentle slopes, built by the eruption of low-viscosity lava that can flow long distances.

Fluid Lava

Magma that has reached the surface through a volcanic eruption and flows easily due to its low viscosity.

Viscous Lava

Lava that is thick and slow-moving due to its high silica content, which increases its viscosity.