Question 1

Which of the following best explains why water is considered a 'universal solvent' in biological systems?

Accepted Answer

Because water is a polar molecule, allowing it to dissolve many ionic and polar substances.

Question 2

A patient is experiencing a rapid drop in blood pH due to metabolic acidosis. Which physiological buffer system is primarily responsible for minimizing this change?

Accepted Answer

The carbonic acid-bicarbonate system

Question 3

Which of the following statements about enzymes is CORRECT?

Accepted Answer

Enzymes act as biological catalysts by lowering activation energy.

Question 4

A molecule of glucose ($$\mathrm{C_6H_{12}O_6$}) is $$broken down into two molecules of pyruvate during glycolysis. This process is an example of which type of chemical reaction?

Accepted Answer

Catabolic reaction

Question 5

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

Accepted Answer

Saturated fatty acids contain only single bonds between carbon atoms, while unsaturated fatty acids contain one or more double bonds.

Question 6

A protein loses its three-dimensional structure and function after being exposed to high temperature. This process is called:

Accepted Answer

Denaturation

Question 7

Which of the following is TRUE regarding the pH scale?

Accepted Answer

A solution with pH 7 is considered neutral.

Question 8

Which of the following best describes the role of ATP in cellular processes?

Accepted Answer

ATP provides energy for cellular work through phosphorylation.

Question 9

A scientist is studying a molecule with the following characteristics: contains carbon, hydrogen, oxygen, and nitrogen; made of amino acids linked by peptide bonds; can be denatured by heat or pH changes. This molecule is most likely a:

Accepted Answer

Protein

Question 10

Which of the following best explains why ionic compounds such as salts are important in the human body?

Accepted Answer

They act as electrolytes, conducting electrical currents in body fluids.

Question 11

Which of the following is a correct statement about dehydration synthesis?

Accepted Answer

It removes water to bond two molecules together.

Question 12

A patient has a genetic mutation that prevents the production of essential amino acids. Which of the following is the most likely consequence?

Accepted Answer

The patient must obtain these amino acids from their diet to maintain normal protein synthesis.

Question 13

Which of the following best describes the relationship between atomic number and mass number?

Accepted Answer

Atomic number is the number of protons; mass number is the sum of protons and neutrons.

Question 14

Which of the following is a function of phospholipids in the human body?

Accepted Answer

They maintain cell membrane structure.

Question 15

A solution contains a high concentration of $$\mathrm{H^+}$$ ions. Which of the following best describes this solution?

Accepted Answer

It is acidic and has a low pH.

Question 16

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

Accepted Answer

DNA is double-stranded and stores genetic information; RNA is single-stranded and involved in protein synthesis.

Question 17

Which of the following best explains why enzymes are sensitive to changes in pH and temperature?

Accepted Answer

Changes in pH and temperature can alter the enzyme's active site, leading to loss of function.

Question 18

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in a water molecule ($$\mathrm{H_2O})$$

Question 19

A patient is given a medication that acts as a catalyst for a metabolic reaction. Which of the following best describes the effect of this medication?

Accepted Answer

It increases the speed of the reaction by lowering activation energy.

Question 20

Which of the following best describes the process of hydrolysis?

Accepted Answer

It splits a molecule into two by adding water.

Chapter 2: Life Chemistry – Foundations for Anatomy & Physiology

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