Question 1

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is a general term for two or more atoms bonded together, while a compound specifically contains two or more different kinds of atoms bonded together.

Question 2

Which of the following mixtures would best be classified as a colloid?

Accepted Answer

Jell-O

Question 3

Which property of water allows it to absorb and release large amounts of heat with little temperature change, thus helping maintain body temperature homeostasis?

Accepted Answer

High heat capacity

Question 4

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

Accepted Answer

Amino acids joining together to form a protein molecule

Question 5

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids release hydrogen ions ($$H^+) in $$solution, while bases release hydroxyl ions ($$OH^-).$$

Question 6

A solution with a pH of 5 has how many times more hydrogen ions than a solution with a pH of 7?

Accepted Answer

100 times more

Question 7

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

Accepted Answer

Its polar nature allows it to dissolve and transport many substances necessary for life.

Question 8

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

Accepted Answer

Maintaining nerve impulse transmission and muscle contraction through electrolyte properties

Question 9

Which of the following statements about organic compounds is true?

Accepted Answer

All organic compounds contain carbon and are made by living things.

Question 10

Which of the following best describes the role of buffers in the body?

Accepted Answer

Buffers resist abrupt and large swings in the pH of body fluids by releasing or binding hydrogen ions.

Question 11

Which of the following is a polysaccharide that serves as the main storage form of carbohydrate in animal tissues?

Accepted Answer

Glycogen

Question 12

Which of the following best explains why triglycerides are considered the most efficient form of stored energy in the body?

Accepted Answer

They yield large amounts of energy when oxidized and are compactly stored beneath the skin.

Question 13

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions, making them ideal for forming cellular membranes.

Question 14

Which of the following is NOT a function of cholesterol in the body?

Accepted Answer

Providing the main source of energy for muscle contraction

Question 15

Which of the following best describes the difference between fibrous and globular proteins?

Accepted Answer

Fibrous proteins provide mechanical support and tensile strength, while globular proteins are water-soluble and play functional roles such as enzymes and antibodies.

Question 16

Which of the following is a correct statement about nucleic acids?

Accepted Answer

DNA replicates itself before cell division and directs protein synthesis.

Question 17

A patient presents with an arterial pH of 6.8. Which of the following best describes the clinical significance of this finding?

Accepted Answer

This pH is dangerously low and may be incompatible with survival.

Question 18

Which of the following best explains why cellulose is important in the human diet, even though it cannot be digested?

Accepted Answer

It acts as a bulk fiber that helps move feces through the colon.

Question 19

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that results in a net release of energy.

Question 20

Which of the following factors would NOT increase the rate of a chemical reaction in the body?

Accepted Answer

Removing all catalysts from the reaction

Basic Principles of Chemistry for Anatomy & Physiology

Guida di studio - Domande di pratica

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