Exam 3: Proteins, Carbohydrates, and Lipids

Refer to the figure below, showing the structure of an amino acid found in living organisms. Which figure correctly highlights the portion of this amino acid that differs from other amino acids also found in living organisms?

Which substance is likely to contain the highest percentage of double bonds in the hydrocarbon chains of its triglycerides?

Where would the leucine side chain most likely be found in a protein dissolved in water?

Leucine and valine have side chains that do not interact with water; therefore, they

In a biological membrane, the phospholipids are arranged with the fatty acid chains facing the interior of the membrane.As a result, the interior of the membrane is

If all of the cysteine residues of a protein were changed to threonines,

Refer to the table below. A triglyceride contains glycerol bonded to three stearic acid residues.The molecule that is likely to have a melting point closest to that of this triglyceride is a triglyceride containing

The main function of cellulose, the most abundant organic compound on Earth, is

A protein contains two cysteine residues that are widely separated in its amino acid sequence but form a disulfide bridge in its tertiary structure.Which is the most likely outcome if one of these cysteine residues is replaced with an alanine residue?

If a hydrophilic amino acid on the surface of an enzyme were changed to a hydrophobic amino acid, which result would be possible?

A peptide bond forms between a(n) _______ group on one molecule and a(n) _______ group on the other molecule.

Aldehydes and ketones are very similar in that they both contain

Which statement provides evidence supporting the claim that glucose has a specific binding interaction with a protein?

Which treatment of a mouse protein has the potential to cause either a dramatic change or very little change in its tertiary structure?

Oligosaccharides are commonly

On the label of a shortening container are the words "hydrogenated vegetable oil." This means that during processing, the number of carbon-carbon double bonds in the oil was decreased and the

Refer to the figures numbered 1, 2, 3, and 4 below. The molecular structures shown represent classes of macromolecules that make up living organisms.A nucleic acid is shown above the number _______.

Refer to the figure below showing the straight-chain form of glucose. The oxygen bound to carbon _______ becomes one of the members of the ring that forms when this molecule cyclizes.

Lipids differ from polysaccharides in that they

Two identical samples of a purified protein were subjected to different treatment steps.The biological activity of the protein after each step was measured, as summarized in the table below. Which statement about structure-function relationships in proteins is consistent with the data?