Question 1

Which structural feature distinguishes an unsaturated fatty acid from a saturated fatty acid?

Accepted Answer

Unsaturated fatty acids have a double bond in their hydrocarbon tail, causing a kink.

Question 2

At room temperature, which property is most likely true for a fat molecule with a kinked tail?

Accepted Answer

It is liquid because the kink prevents tight packing.

Question 3

Which of the following foods is most likely to contain unsaturated fats?

Accepted Answer

Olive oil

Question 4

Why are unsaturated fats considered more likely to be liquid at room temperature than saturated fats?

Accepted Answer

The double bonds in unsaturated fats create kinks, preventing molecules from packing closely.

Question 5

Which equation best represents the formation of a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$$

Question 6

Which part of a phospholipid molecule is hydrophilic?

Accepted Answer

The phosphate head group

Question 7

A patient is diagnosed with atherosclerosis. Which dietary change would most likely help reduce their risk?

Accepted Answer

Increase intake of unsaturated fats

Question 8

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

Accepted Answer

They must be obtained from the diet because the body cannot synthesize them.

Question 9

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

Accepted Answer

The hydrophilic heads interact with water, while the hydrophobic tails avoid it.

Question 10

Which macromolecule is primarily responsible for energy storage in animals?

Accepted Answer

Glycogen

Question 11

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

Accepted Answer

Transporting molecules such as toxins

Question 12

What is the primary structure of a protein?

Accepted Answer

The sequence of amino acids in the polypeptide chain

Question 13

Which of the following best describes the backbone of an amino acid?

Accepted Answer

A central carbon atom bonded to a carboxyl group and an amino group

Question 14

Which of the following is true about steroids?

Accepted Answer

They are lipids with a structure of four fused carbon rings.

Question 15

A mutation causes a change in the primary structure of a protein. What is the most likely consequence?

Accepted Answer

The protein may fold incorrectly, losing its function.

Question 16

Which of the following is a correct statement about the hydrophobic and hydrophilic regions of a phospholipid?

Accepted Answer

The heads are hydrophilic and the tails are hydrophobic.

Question 17

Which of the following is a real-world consequence of consuming too many saturated fats?

Accepted Answer

Increased risk of atherosclerosis

Question 18

Which of the following best describes the role of peptide bonds in proteins?

Accepted Answer

They connect amino acids to form polypeptides.

Question 19

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

Accepted Answer

Storing energy as glycogen

Question 20

Which of the following molecules is most likely to be found in the cell membrane and is crucial for memory?

Accepted Answer

Phospholipids

Lipids and Proteins: Structure, Function, and Biological Importance

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