chapter 18

Which pair of amino acids can form hydrogen bonds between their R groups?

glutamine and serine

The quaternary structure of hemoglobin contains

 

four subunits.

Which of the following processes involve protein denaturation?

More than one response is correct.

In the tetrapeptide Ala-Cys-Val-Leu, the C-terminal amino acid is

Leu

By convention, the N-terminal end of a protein is usually placed on the ________ of a protein structure.

 

left side

Proteins that consist of two or more chains assembled into a large 3-dimensional structure are said to display

quaternary structure.

Amino acids found in proteins all have which of the following features?

 

All are α-amino acids.

All of the following are examples of denaturing proteins except

 

digestion of a meal.

The pH at which the positive and negative charges of an amino acid balance each other is called the

 

isoelectric point.

The type of bond that is most important in maintaining secondary structure of a protein is

 

hydrogen bonding within the backbone.

Oxytocin is a small protein that induces smooth muscle causing contractions during labor. What class of proteins would this belong to?

hormone

The tripeptide represented as ala-leu-gly is named

alanylleucylglycine

The side chains or R groups of amino acids can be classified into each of the following categories except

isoelectric

Which of the following amino acids contains an alcohol group?

Thr

Polar R groups, along with acidic and basic R groups, are said to be ________ because they are attracted to water molecules.

hydrophilic

Which amino acid can form covalent sulfur-sulfur bonds?

cysteine

When a glycoprotein is hydrolyzed, the products would include

amino acids plus carbohydrates.

Which amino acid is a secondary amine with its nitrogen and the alpha-carbon joined as part of a ring structure?

proline

Which amino acid is classified as basic?

lysine

The beta-pleated sheet is an example of

 

secondary structure.

An amino acid whose R group is predominantly hydrocarbon would be classified as

non polar

The N-terminal amino acid in the peptide Ala-Leu-Gly-His-Pro is

alanine

The two protein chains in insulin are held together by

disulfide linkages.

The peptide bond joining amino acids into proteins is a specific example of the ________ bond.

Amide

The protein configuration that is primarily determined from interactions between R groups is the

tertiary structure.

When a protein is ________, its primary structure is maintained, but other aspects of its structure are disrupted.

denatured

Which type of forces form the primary structure of a protein?

peptide

Which protein is considered to be a globular protein?

albumin

Two functional groups that are present in all amino acids are the ________ group and the ________ group.

 

carboxyl; amine