Question 1

Which of the following best explains why trans fats are considered more harmful to cardiovascular health than saturated fats?

Accepted Answer

Trans fats increase plaque deposits in arteries more than saturated fats, leading to a higher risk of cardiovascular disease.

Question 2

A phospholipid placed in water will spontaneously form a bilayer. Which property of phospholipids is primarily responsible for this behavior?

Accepted Answer

The amphipathic nature, with hydrophilic heads and hydrophobic tails.

Question 3

Which of the following statements about the structure of steroids is correct?

Accepted Answer

Steroids have a backbone of four fused hydrocarbon rings.

Question 4

Which component of an amino acid determines its unique chemical properties?

Accepted Answer

The side chain (R group)

Question 5

A protein that functions as an enzyme is most likely to be classified under which category of protein function?

Accepted Answer

Catalytic protein

Question 6

Which of the following amino acids would most likely be found in the interior of a protein embedded in a cell membrane?

Accepted Answer

Valine

Question 7

During the formation of a peptide bond, which of the following occurs?

Accepted Answer

A hydroxyl group from the carboxyl end and a hydrogen from the amino end are removed to form water.

Question 8

Which of the following best describes the relationship between protein structure and function?

Accepted Answer

The specific activities of proteins result from their intricate three-dimensional architecture.

Question 9

Which of the following is a correct statement about the directionality of polypeptide synthesis?

Accepted Answer

Polypeptides are synthesized from the N-terminus to the C-terminus.

Question 10

Which of the following best explains why nonpolar amino acids tend to cluster together in the interior of a protein in aqueous solution?

Accepted Answer

Nonpolar amino acids are hydrophobic and avoid contact with water.

Question 11

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

Accepted Answer

Protecting against disease by neutralizing pathogens

Question 12

A mutation changes a polar amino acid in the active site of an enzyme to a nonpolar amino acid. What is the most likely effect on enzyme function?

Accepted Answer

The enzyme's active site may lose its ability to interact with polar substrates.

Question 13

Which of the following best describes the difference between a space-filling model and a ribbon model of a protein?

Accepted Answer

A ribbon model shows the folding pattern of the backbone, while a space-filling model shows the atoms involved.

Question 14

Which of the following is true about the primary structure of a protein?

Accepted Answer

It is determined by the sequence of amino acids from the N-terminus to the C-terminus.

Question 15

Which of the following best explains why cholesterol is considered a steroid?

Accepted Answer

It contains a four-ringed hydrocarbon skeleton.

Question 16

Which of the following amino acids is most likely to be found on the surface of a protein exposed to the cytoplasm?

Accepted Answer

Serine

Question 17

Which of the following best describes the role of the R group in an amino acid?

Accepted Answer

It determines the chemical and physical properties of the amino acid.

Question 18

Which of the following is a correct statement about the formation of a phospholipid bilayer?

Accepted Answer

Hydrophilic heads face the aqueous environment, while hydrophobic tails face inward.

Bio 100 Lec Chapter 5 Part 2

Study Guide - Practice Questions