Question 1

Which of the following best describes the difference between organic and inorganic compounds in living organisms?

Accepted Answer

Organic compounds contain carbon and are associated with living things, while inorganic compounds (such as water, salts, acids, and bases) generally do not contain carbon.

Question 2

Water is essential for life due to its unique properties. Which property of water allows it to dissolve many substances, making it an excellent solvent in biological systems?

Accepted Answer

Its polar structure and ability to form hydrogen bonds

Question 3

Electrolytes are important in the human body because they:

Accepted Answer

Dissociate in water to produce ions that conduct electricity

Question 4

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

Accepted Answer

It is acidic, with a higher concentration of hydrogen ions ($$H^+) $$than hydroxyl ions ($$OH^-).$$

Question 5

Which of the following is a function of buffers in biological systems?

Accepted Answer

Buffers minimize changes in pH when small amounts of acid or base are added.

Question 6

Which of the following is NOT one of the four main classes of organic compounds found in living organisms?

Accepted Answer

Electrolytes

Question 7

Which process is responsible for joining monosaccharides to form disaccharides and polysaccharides?

Accepted Answer

Dehydration synthesis

Question 8

Triglycerides are composed of which two types of molecules?

Accepted Answer

Glycerol and fatty acids

Question 9

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids are the main component of cell membranes due to their amphipathic nature.

Question 10

Which type of fatty acid contains one or more double bonds between carbon atoms?

Accepted Answer

Unsaturated fatty acids

Question 11

Proteins are made up of amino acids. What type of bond forms between adjacent amino acids during protein synthesis?

Accepted Answer

Peptide bond

Question 12

What happens to a protein when it is exposed to excessive heat or extreme pH changes?

Accepted Answer

It denatures, losing its functional shape.

Question 13

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

Accepted Answer

Speeding up chemical reactions as enzymes

Question 14

Which of the following best describes the structure of DNA?

Accepted Answer

Double helix with thymine as a base

Question 15

Which of the following is a correct complementary base pairing in DNA?

Accepted Answer

Adenine pairs with thymine

Question 16

A patient is experiencing muscle cramps due to an imbalance of sodium and potassium ions. Which class of compounds is most directly involved in this condition?

Accepted Answer

Electrolytes

Question 17

Which of the following equations correctly represents the neutralization of an acid and a base in water?

Accepted Answer

$$H^+ + OH^- \rightarrow H_2O$$

Question 18

Which of the following best explains why water is able to moderate temperature changes in living organisms?

Accepted Answer

Water's hydrogen bonds require significant energy to break, giving it a high specific heat capacity.

Question 19

Which of the following statements about nucleic acids is correct?

Accepted Answer

Nucleic acids store genetic information in the form of nucleotide sequences.

Question 20

A biochemist is analyzing a molecule with the following structure: a phosphate group, a pentose sugar, and a nitrogenous base. What type of molecule is this?

Accepted Answer

Nucleotide

Fundamental Chemical Compounds in Anatomy & Physiology

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