Chapter 14- Proteins

Proteins are responsible for which function(s)?

• Catalysis

• Movement

• Storage

• All of the above

Which protein is generally soluble in water?

• Fibrous

• Globular

• Fibrous and globular

• Neither

How many amino acids are commonly found in proteins?

• 10

• 20

• 200

• 1000

What is the isoelectric point (pI)?

• A pH at which a sample of amino acids or protein has an equal number of positive and negative charges.

• An amide bond that links two amino acids.

• The amino acid at the end of a peptide that has a free a-carboxyl group.

• The amino acid at the end of a peptide that has a free a-amino group.

What can you ingest to combat heavy metal poisoning?

• Aspirin and orange juice

• Coca-cola and mentos

• Raw egg whites and milk

• Water and crackers

When a protein contains an uncommon amino acid, when in the process is the amino acid modified?

• Before protein is formed

• In the middle of the formation of the protein

• After the protein is formed

Amino acids in a chain

• Residues

• N-terminus

• C-terminus

• Peptide bond

Protein synthesis proceeds from the

• C-terminus to the N-terminus

• Middle toward the two ends

• N-terminus to the C-terminus

• Direction varies from one protein to another

A protein will have its lowest solubility

• When the pH is low

• When the pH is high

• When the pH is 7.0

• At its isoelectric point

When you change the primary structure of a protein, how is the protein function affected?

• Changing an amino acid always affects the function.

• Changing an amino acid may or may not affect protein function.

• Changing an amino acid never changes the function.

• There is no relationship between the structure and function.