Question 1

Which of the following statements best explains why lipids are not considered true polymers, unlike carbohydrates, proteins, and nucleic acids?

Accepted Answer

Lipids do not consist of long chains of identical or similar monomers.

Question 2

A scientist is studying a protein that has lost its function after being exposed to high temperatures. Which process most likely occurred, and what is a possible cellular response?

Accepted Answer

Denaturation; chaperone proteins may assist in refolding the protein.

Question 3

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded and contains deoxyribose; RNA is usually single-stranded and contains ribose.

Question 4

Which of the following molecules can freely diffuse across a biological membrane without the help of a transport protein?

Accepted Answer

Small, nonpolar molecules like $$O_2$$

Question 5

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and why?

Accepted Answer

It will swell and possibly burst because water moves into the cell.

Question 6

Which of the following best describes the role of mitochondria in eukaryotic cells?

Accepted Answer

They are the site of cellular respiration, producing ATP from food molecules.

Question 7

Which of the following is a function of the Golgi apparatus in the endomembrane system?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion

Question 8

Which of the following equations correctly represents the change in free energy ($$\Delta G) $$for a chemical reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 9

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

Enzymes lower the activation energy barrier, speeding up reactions.

Question 10

A cell needs to move sodium ions ($$Na^+) $$from a low concentration outside the cell to a high concentration inside the cell. Which transport mechanism will it use?

Accepted Answer

Primary active transport using ATP

Question 11

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Carbohydrate – Monosaccharide

Question 12

Which of the following statements about feedback inhibition is correct?

Accepted Answer

The final product of a metabolic pathway inhibits an earlier step in the same pathway.

Question 13

Which of the following best describes the structure of a phospholipid and its importance in biological membranes?

Accepted Answer

Phospholipids are amphipathic, with hydrophilic heads and hydrophobic tails, allowing them to form bilayers.

Question 14

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Providing cell shape, structure, and facilitating movement

Question 15

Which of the following best describes the difference between competitive and noncompetitive enzyme inhibitors?

Accepted Answer

Competitive inhibitors bind to the active site, while noncompetitive inhibitors bind to a different site on the enzyme.

Question 16

Which of the following is a correct description of osmosis?

Accepted Answer

The passive diffusion of water from low to high water concentration (or from hypotonic to hypertonic solution) across a membrane.

Question 17

Which of the following best explains why trans fats are considered unhealthy compared to other types of fats?

Accepted Answer

Trans fats are artificially produced unsaturated fats with a linear structure, which can increase the risk of cardiovascular disease.

Question 18

Which of the following is a function of cholesterol in animal cell membranes?

Accepted Answer

It helps maintain membrane fluidity across temperature changes.

Question 19

Which of the following best describes the role of ATP hydrolysis in cellular metabolism?

Accepted Answer

ATP hydrolysis releases energy that can be used to drive endergonic reactions.

Question 20

Which of the following is a correct statement about the first law of thermodynamics?

Accepted Answer

Energy can be transferred and transformed, but cannot be created or destroyed.

Biomolecules, Cell Structure, Membrane Function, and Metabolism: Study Notes for Biology College Students

Study Guide - Practice Questions

Study Guide - Flashcards