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

What is the main cause of protein denaturation, and what is its impact on protein function?

Accepted Answer

Exposure to extreme pH or temperature disrupts hydrogen bonds, causing loss of structure and function.

Question 3

Which of the following is NOT a major region of a generalized cell?

Accepted Answer

Mitochondria

Question 4

The plasma membrane is primarily composed of which molecules, and how does this composition affect selective permeability?

Accepted Answer

Phospholipids and proteins; the hydrophobic core restricts passage of polar molecules.

Question 5

Which junction allows ions and small molecules to pass directly from one cell to another?

Accepted Answer

Gap junction

Question 6

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

It will lose water and shrink.

Question 7

Which transport process requires energy in the form of ATP and moves substances against their concentration gradient?

Accepted Answer

Primary active transport

Question 8

During receptor-mediated endocytosis, what is the main function of receptors?

Accepted Answer

To bind specific ligands and initiate vesicle formation.

Question 9

Which organelle is responsible for ATP production in the cell?

Accepted Answer

Mitochondria

Question 10

What is the function of the nucleolus within the nucleus?

Accepted Answer

Synthesis of ribosomal RNA (rRNA)

Question 11

Which cytoskeletal element is primarily responsible for maintaining cell shape and resisting mechanical stress?

Accepted Answer

Intermediate filaments

Question 12

What is the role of tRNA during translation in protein synthesis?

Accepted Answer

To deliver specific amino acids to the ribosome based on mRNA codons.

Question 13

Which equation best represents osmotic pressure ($$\Pi) $$according to van't Hoff's law?

Accepted Answer

$$\Pi = iCRT$$

Question 14

A cell with a defective sodium-potassium pump would have trouble maintaining which type of gradient?

Accepted Answer

Electrochemical gradient

Question 15

Which process involves the engulfment of large particles, such as bacteria, by the cell?

Accepted Answer

Phagocytosis

Question 16

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

Modifies, sorts, and packages proteins for secretion.

Question 17

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand?

Accepted Answer

DNA polymerase

Question 18

Which of the following is a function of peroxisomes in the cell?

Accepted Answer

Breakdown of hydrogen peroxide and fatty acids.

Question 19

Which phase of protein synthesis involves the decoding of mRNA into a polypeptide chain?

Accepted Answer

Translation

Question 20

If a cell is placed in an isotonic solution, what will happen to the cell?

Accepted Answer

There will be no net movement of water; the cell remains unchanged.

Study Guide: Chemistry Comes Alive & Cells—The Living Units (CH 02-03)

Study Guide - Practice Questions