Blackboard Practice Questions

In an enzyme active site, K and D interact via non-covalent connections. The microenvironment in the enzyme has a pH = 8.0. What is the nature of the non-covalent interaction between K and D?

ion-ion

The following amino acids make up the active site of an enzyme SYGCCT. Based on this information, the active site is made up of predominantly?

hydrophobic amino acids

What is an apoenzyme?

protein component of an enzyme, which requires a cofactor to become fully active.

The apoenzyme is the enzyme form that is associated with its cofactor.

false

In the presence of a non-competitive inhibitor:

Vmax decreases

In the presence of a competitive inhibitor:

Km increases

When the linear form of glucose cyclizes, the product is a(n):

hemiacetal.

When forming the disaccharide maltose from two glucose monosaccharides:

water is eliminated and a hemiacetal is converted to an acetal.

Starch and glycogen are both polymers of:

α-D-glucose.

Which pair is epimeric?

D-glucose and D-mannose

What type of sugar is fructose?

hexose

When two carbohydrates are epimers:

they differ only in the configuration around one carbon atom.

The backbone (platform) of a phospholipid is a:

glycerol.

Triacylglycerols are composed of:

a glycerol backbone with ester links to three fatty acids.

Which vitamin is fat soluble?

All of the answers are correct.

Which statement is true of lipids?

Many contain fatty acids involved in ester or amide linkages.

Which type of chemical linkage is used to join fatty acids to glycerol?

ester linkage

Describe lipid head.

polar, hydrophilic, lipophobic

Describe lipid tail.

non-polar, hydrophobic, lipophilic