Question 1

Which of the following best describes the field of biochemistry?

Accepted Answer

The study of the chemical reactions and processes occurring in living organisms.

Question 2

Which of the following is NOT one of the four major classes of biomacromolecules in the human body?

Accepted Answer

Vitamins

Question 3

A patient is diagnosed with anemia due to low iron storage. Which protein is most likely measured in their blood to confirm this diagnosis?

Accepted Answer

Ferritin

Question 4

Which of the following functional groups can act as hydrogen bond donors? Select all that apply.

Accepted Answer

Amine group and amide group

Question 5

Which class of biomolecules is the primary component of cellular membranes, as shown in the second image?

Accepted Answer

Lipids

Question 6

Which of the following statements about amino acids is TRUE?

Accepted Answer

All amino acids except glycine have a chiral alpha carbon.

Question 7

Which of the following best describes a zwitterion?

Accepted Answer

A molecule with both a positive and a negative charge, but overall neutral.

Question 8

At physiological pH ($$pH = 7.4$$), which backbone functional groups of an amino acid are charged?

Accepted Answer

The amine has a positive charge and the carboxylic acid has a negative charge.

Question 9

Which of the following amino acids is most likely to be found on the interior of a folded protein, away from water?

Accepted Answer

Leucine

Question 10

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids linked by peptide bonds from the N-terminus to the C-terminus.

Question 11

Which of the following amino acids is considered 'shape-determining' due to its unique side chain structure?

Accepted Answer

Proline

Question 12

Which of the following interactions is primarily responsible for stabilizing the secondary structure of proteins, such as alpha helices and beta sheets?

Accepted Answer

Hydrogen bonds forming between peptide bonds

Question 13

Which class of amino acids have side chains that can form hydrogen bonds with water?

Accepted Answer

Neutral polar, acidic and basic

Question 14

Which of the following statements about disulfide bonds is TRUE?

Accepted Answer

They are covalent bonds formed between the thiol groups of two cysteine residues.

Question 15

Which of the following best describes the quaternary structure of a protein?

Accepted Answer

The assembly of multiple polypeptide chains into a functional protein complex.

Question 16

Which of the following is a real-world example of a protein with quaternary structure?

Accepted Answer

Hemoglobin

Question 17

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information

Question 18

Which of the following best explains why glycine is unique among the amino acids?

Accepted Answer

It does not have a chiral center.

Question 19

Which of the following statements about isomers is CORRECT?

Accepted Answer

Enantiomers are stereoisomers that are non-superimposable mirror images.

Question 20

Which class of amino acids prefer to have their side chains in a hydrophobic environment?

Accepted Answer

Nonpolar

Proteins and Their Amino Acid Building Blocks: Structure and Function

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