Question 1

Which of the following best describes a tertiary amine?

Accepted Answer

An amine where the nitrogen atom is bonded to three alkyl or aryl groups and no hydrogen atoms.

Question 2

Which of the following statements about the basicity of amines is correct?

Accepted Answer

Amines act as bases by accepting a proton from water, forming $$\mathrm{$$RNH_3$$^+}$$ and $$\mathrm{OH^-}.$$

Question 3

Which of the following is a hydrolyzable lipid?

Accepted Answer

Triacylglycerols

Question 4

Which of the following best explains how soap works to remove grease from clothing?

Accepted Answer

Soap molecules have a hydrophobic tail that dissolves in grease and a hydrophilic head that interacts with water, forming micelles that trap grease.

Question 5

Which of the following is NOT a component of a phospholipid?

Accepted Answer

Steroid nucleus

Question 6

Which of the following statements about cholesterol is TRUE?

Accepted Answer

Cholesterol contains four fused rings known as the steroid nucleus.

Question 7

Which of the following best describes the difference between LDL and HDL?

Accepted Answer

LDL is considered 'bad' cholesterol because it deposits cholesterol in arteries, while HDL is 'good' cholesterol because it removes cholesterol from the bloodstream.

Question 8

Which of the following is a correct Fischer projection for D-glucose?

Accepted Answer

A six-carbon chain with the hydroxyl group on the right at C-2, left at C-3, right at C-4, left at C-5.

Question 9

Which of the following reactions forms a glycosidic bond?

Accepted Answer

The reaction of two monosaccharides with the elimination of water.

Question 10

Which of the following amino acids is classified as basic?

Accepted Answer

Lysine

Question 11

At a pH below its isoelectric point ($$pI$$), an amino acid will:

Accepted Answer

Have a net positive charge

Question 12

Which of the following interactions is NOT involved in the tertiary structure of proteins?

Accepted Answer

Peptide bonds

Question 13

Which of the following best describes the induced fit model of enzyme action?

Accepted Answer

The enzyme's active site changes shape to better fit the substrate upon binding.

Question 14

Which of the following statements about enzyme activity is correct?

Accepted Answer

Enzyme activity is highest at the enzyme's optimal pH and temperature.

Question 15

Which of the following is a correct description of a peptide bond?

Accepted Answer

A bond formed between the carboxyl group of one amino acid and the amino group of another, releasing water.

Question 16

Which of the following is a nonhydrolyzable lipid?

Accepted Answer

Steroid

Question 17

Which of the following best describes the difference between an anomer and an enantiomer of glucose?

Accepted Answer

Anomers differ at the anomeric carbon, while enantiomers are non-superimposable mirror images.

Question 18

Which of the following is a correct statement about the hydrolysis of triacylglycerols?

Accepted Answer

Hydrolysis of triacylglycerols produces three fatty acids and one glycerol molecule.

Question 19

Which of the following is a fat-soluble vitamin?

Accepted Answer

Vitamin D

Question 20

Which of the following best describes the role of phospholipids in cell membranes?

Accepted Answer

They form a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward, creating a semi-permeable barrier.

Comprehensive Study Notes: Amines, Lipids, Carbohydrates, Amino Acids, Proteins, and Enzymes

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