Question 1

Which property of carbon is primarily responsible for the diversity of organic molecules found in living organisms?

Accepted Answer

Its ability to form up to four covalent bonds with other atoms

Question 2

The Miller-Urey experiment (1953) was significant because it demonstrated that:

Accepted Answer

Organic molecules such as amino acids can form spontaneously under conditions simulating early Earth

Question 3

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule composed only of carbon and hydrogen

Question 4

Which of the following is NOT a way in which carbon skeletons can vary?

Accepted Answer

Type of peptide bond

Question 5

A molecule of adenosine triphosphate (ATP) releases energy when:

Accepted Answer

A phosphate group is removed by hydrolysis

Question 6

Which chemical group is responsible for the acidic properties of amino acids and fatty acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 7

Which of the following statements about dehydration synthesis and hydrolysis is correct?

Accepted Answer

Dehydration synthesis joins monomers to form polymers by removing water

Question 8

Which of the following best explains why unsaturated fats are typically liquid at room temperature while saturated fats are solid?

Accepted Answer

Unsaturated fats have double bonds that create kinks, preventing tight packing

Question 9

Which of the following is a structural polysaccharide found in plant cell walls?

Accepted Answer

Cellulose

Question 10

A protein loses its function when it is denatured because:

Accepted Answer

Its three-dimensional shape is altered

Question 11

Which of the following is a correct description of a nucleotide found in DNA?

Accepted Answer

A sugar, a phosphate group, and a nitrogenous base

Question 12

Which of the following best describes the flow of genetic information in a cell?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 13

Which of the following is a function of phospholipids in cells?

Accepted Answer

Forming the main component of cell membranes

Question 14

A patient is found to have a mutation that changes a single amino acid in a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 15

Which of the following best explains why lipids release more energy per gram than carbohydrates when metabolized?

Accepted Answer

Lipids have more C-H bonds, which store more potential energy

Question 16

Which of the following is a correct general formula for a monosaccharide?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 17

Which of the following best describes the role of enzymes in biological systems?

Accepted Answer

They speed up chemical reactions by lowering activation energy

Question 18

A triglyceride is formed by the reaction of:

Accepted Answer

One glycerol molecule and three fatty acids

Question 19

Which of the following is a real-life consequence of the structure of phospholipids?

Accepted Answer

They allow cell membranes to form bilayers with hydrophobic interiors

Question 20

A person with sickle cell disease has a single amino acid change in the hemoglobin protein. This change most directly affects which property of the protein?

Accepted Answer

Its three-dimensional shape and function

Life’s Molecular Diversity: The Chemistry of Organic Molecules

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