Exam 3: Proteins, Carbohydrates, and Lipids

Refer to the figure below. What level of protein structure is illustrated in sections A and B of this polypeptide, and what types of forces indicated by the letter C stabilize these sections?

There are a number of functional groups in biological molecules.Which statement about functional groups is accurate?

Which protein is predicted to be most resistant to denaturation by heat?

Refer to the figure below. Cellulose and glycogen are not soluble in water, but starch is.What feature explains these differences?

Salt bridges are a part of a protein's tertiary structure and can occur between

Which statement about the three-dimensional structure of a protein is true?

The linear arrangement of amino acids in the polypeptide chain is referred to as the _______ structure of the protein.

Molecules that both attract and repel water are called

Fructose has a five-member ring like deoxyribose and ribose.However, fructose is not classified as a pentose, because it has _______ carbon atoms.

Glucosamine and galactosamine are monosaccharides in which a hydroxyl group has been replaced by a(n) _______ group.

Refer to the figure below, summarizing how macromolecules are formed and broken down. Identify the two types of reactions (reaction 1 and reaction 2), and describe how one requires energy and how the other releases energy.

Phospholipids are

All of the following are examples of lipids except

Refer to the figure showing one of the two cyclic forms of fructose. The covalent bond that results during cyclization of the straight-chain form is indicated by which number?

Glycogen is all of the following except

Figure A shows a protein consisting of two identical subunits.Figure B shows the same protein after each subunit has been covalently modified with a phosphate group. Based on the activities shown in the diagrams, what biological advantage does this protein gain by having the ability to undergo a reversible phosphorylation-dephosphorylation reaction?

In response to low blood sugar, the body breaks down glycogen stored in the liver into monomers of _______.

Cholesterol is soluble in chloroform, a nonpolar organic solvent, but it is not soluble in water.Based on this information, cholesterol belongs to what class of biological macromolecules?

Refer to the figures below. Figure 1 is a hexose sugar, while figure 2 is a _______ sugar.

Refer to the figures below. The hydrophobic amino acids are those with numbers _______.