Question 1

Which of the following best describes an isotope?

Accepted Answer

An atom with the same number of protons but a different number of neutrons compared to other atoms of the same element.

Question 2

Which of the following elements is most abundant in the human body and is essential for cellular respiration?

Accepted Answer

Oxygen

Question 3

A patient’s blood pH drops to 6.8. Which of the following best describes this condition and its potential effect?

Accepted Answer

The blood is acidic, which can disrupt enzyme function and threaten life.

Question 4

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

It has a partial positive charge on one side and a partial negative charge on the other due to unequal sharing of electrons.

Question 5

Which of the following is a correct statement about covalent bonds?

Accepted Answer

Covalent bonds involve the sharing of electron pairs between atoms.

Question 6

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-4}$$ M. What is its pH?

Accepted Answer

$$4$$

Question 7

Which of the following best describes the function of a buffer in the human body?

Accepted Answer

A buffer minimizes changes in pH by binding or releasing hydrogen ions.

Question 8

Which of the following is an example of a hydrolysis reaction in the body?

Accepted Answer

Breaking down a polysaccharide into monosaccharides using water.

Question 9

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 10

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction to occur.

Question 11

A patient is unable to digest lactose due to a deficiency in the enzyme lactase. Which type of biomolecule is lactase?

Accepted Answer

Protein

Question 12

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 13

Which of the following best explains why phospholipids are important in cell membranes?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, forming a bilayer that separates the cell from its environment.

Question 14

Which of the following is a correct pairing of a nucleic acid with its function?

Accepted Answer

DNA – stores genetic information

Question 15

Which of the following best describes the role of ATP in the cell?

Accepted Answer

ATP provides energy for cellular processes by releasing a phosphate group.

Question 16

Which of the following is a correct description of a catalyst?

Accepted Answer

A substance that increases the rate of a chemical reaction without being consumed.

Question 17

Which of the following best explains the concept of chemical equilibrium?

Accepted Answer

The rate of the forward reaction equals the rate of the reverse reaction.

Question 18

Which of the following is a real-life example of a dehydration synthesis reaction in the human body?

Accepted Answer

Formation of a peptide bond between two amino acids with the release of water.

Question 19

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

Accepted Answer

The folding of the polypeptide chain into alpha helices and beta sheets stabilized by hydrogen bonds.

Question 20

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which of the following ions is most likely involved?

Accepted Answer

Potassium ($$K^+)$$

Chapter 2: Chemistry of Life – Study Notes for Anatomy & Physiology

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