Changing a Single Amino Acid in a Protein Consisting of 325

question 25

Multiple Choice

Changing a single amino acid in a protein consisting of 325 amino acids would

• A) alter the primary structure of the protein, but not its tertiary structure or function.
• B) cause the tertiary structure of the protein to unfold.
• C) always alter the biological activity or function of the protein.
• D) always alter the primary structure of the protein and disrupt its biological activity.
• E) always alter the primary structure of the protein, sometimes alter the tertiary structure of the protein, and affect its biological activity.

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Definitions:

Duodenum

The first part of the small intestine immediately beyond the stomach, where most chemical digestion takes place.

Jejunum

The mid-section of the small intestine in humans, where most of the digestion and absorption of nutrients occurs.

Crop

Of birds and some invertebrates, an enlarged portion of the esophagus that stores food.

Birds

Warm-blooded, feathered vertebrates with beaks, laying hard-shelled eggs, and capable of flight in most species.