Q: Which of the following equations correctly represents the relationship between hydrogen ion concentration and pH?

$$\text{pH} = -\log_{10}[\text{H}^+]$$

Question 1

Which of the following best describes the difference between a solution, a colloid, and a suspension in the human body?

Accepted Answer

A solution contains solute particles under 1 nm that do not scatter light, a colloid contains particles between 1–100 nm that scatter light, and a suspension contains particles over 100 nm that separate on standing.

Question 2

Which of the following is a function of sodium chloride (NaCl) in the human body?

Accepted Answer

It is essential for fluid balance, nerve impulse transmission, and muscle contraction.

Question 3

A patient is experiencing muscle cramps and irregular heartbeats. Blood tests reveal low potassium levels. Which class of molecules is most directly involved in this condition?

Accepted Answer

Electrolytes

Question 4

Which of the following statements about free radicals is correct?

Accepted Answer

Free radicals are unstable particles that can damage cells and contribute to aging and disease.

Question 5

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

Accepted Answer

Water dissolves more substances than any other liquid, making it essential for transporting nutrients and waste in the body.

Question 6

A solution has a pH of 5. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a high concentration of hydrogen ions.

Question 7

Which of the following equations correctly represents the relationship between hydrogen ion concentration and pH?

Accepted Answer

$$	ext{pH} = -\log_{10}[	ext{H}^+]$$

Question 8

Which of the following best describes the difference between anabolism and catabolism?

Accepted Answer

Anabolism builds molecules using energy, while catabolism breaks down molecules to release energy.

Question 9

Which of the following is a polymer and its corresponding monomer?

Accepted Answer

Starch – glucose

Question 10

Which of the following statements about lipids is correct?

Accepted Answer

Lipids provide more calories per gram than carbohydrates.

Question 11

A patient is advised to increase their intake of essential fatty acids. Which of the following best explains why?

Accepted Answer

Essential fatty acids must be obtained from the diet because the body cannot synthesize them.

Question 12

Which of the following best describes the structure of a triglyceride?

Accepted Answer

Three fatty acids linked to a glycerol molecule

Question 13

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

Accepted Answer

It provides structural integrity to cell membranes and is a precursor for steroid hormones.

Question 14

Which of the following statements about protein structure is correct?

Accepted Answer

The primary structure of a protein is determined by the sequence of nucleotides in DNA.

Question 15

Which of the following best explains how enzymes speed up chemical reactions?

Accepted Answer

Enzymes lower the activation energy required for a reaction.

Question 16

A patient has a fever of 41°C (105.8°F). Which of the following best explains why this is dangerous in terms of enzyme function?

Accepted Answer

High temperatures can denature enzymes, causing them to lose their function.

Question 17

Which of the following best describes the structure of a nucleotide?

Accepted Answer

A phosphate group, a sugar, and a nitrogen base

Question 18

Which of the following base pairing patterns is correct for DNA?

Accepted Answer

Adenine pairs with thymine; guanine pairs with cytosine

Question 19

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

Accepted Answer

RNA reads the genetic code from DNA and helps synthesize proteins.

Question 20

Which of the following best describes the relationship between ATP and energy in the cell?

Accepted Answer

ATP stores energy in its phosphate bonds and releases it when these bonds are broken.

Chapter 2 – Chemistry of Life: Foundations for Anatomy & Physiology

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