Question 1

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

Accepted Answer

The sequence of amino acids linked by peptide bonds

Question 2

A triglyceride is formed by the combination of which of the following components?

Accepted Answer

Three fatty acids and one glycerol

Question 3

Which of the following statements about saturated fatty acids is correct?

Accepted Answer

They have no double bonds between carbon atoms

Question 4

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

They are amphipathic, with hydrophilic heads and hydrophobic tails

Question 5

Which of the following is a function of carbohydrates in the body?

Accepted Answer

Short-term energy storage and cell recognition

Question 6

Which of the following bonds is responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 7

A solution with a pH of 5 has what concentration of hydrogen ions $$[H^+]$$ compared to a solution with a pH of 7?

Accepted Answer

$$100$$ times higher

Question 8

Which of the following is true about DNA and RNA?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose

Question 9

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

They moderate changes in pH by accepting or donating hydrogen ions

Question 10

Which of the following is an example of a noncovalent bond important in biological molecules?

Accepted Answer

Hydrogen bond

Question 11

A competitive inhibitor affects an enzyme by:

Accepted Answer

Binding to the active site and blocking substrate binding

Question 12

Which of the following best describes the difference between a monosaccharide and a disaccharide?

Accepted Answer

A monosaccharide contains one ring, while a disaccharide contains two rings

Question 13

Which of the following is a function of proteins in the body?

Accepted Answer

Acting as enzymes to catalyze reactions

Question 14

Which of the following molecules is most likely to be hydrophobic?

Accepted Answer

A long-chain fatty acid

Question 15

Which of the following best explains why hemoglobin is considered to have quaternary structure?

Accepted Answer

It is composed of multiple polypeptide subunits

Question 16

Which of the following is true regarding the effect of temperature on protein function?

Accepted Answer

High temperatures can denature proteins, causing loss of function

Question 17

Which of the following best describes an amphipathic molecule?

Accepted Answer

It has both hydrophilic and hydrophobic regions

Question 18

Which of the following is a correct pairing of a nucleotide base with its complement in DNA?

Accepted Answer

Adenine with Thymine

Question 19

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

They lower the activation energy required for reactions

Question 20

A patient’s blood pH is measured at 7.30. Which of the following best describes this condition?

Accepted Answer

The blood is slightly acidic

Molecular Interactions: Biomolecules and Chemical Bonds in Human Physiology

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