Question 1

Which property of carbon most directly allows it to serve as the backbone for a diverse array of organic molecules?

Accepted Answer

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

Question 2

Which of the following functional groups is polar and commonly found in carbohydrates, making them soluble in water?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 3

What type of chemical reaction links monomers together to form polymers, and what is the byproduct of this reaction?

Accepted Answer

Dehydration reaction; water is released

Question 4

Which of the following correctly matches a polysaccharide with its primary biological function?

Accepted Answer

Glycogen: energy storage in animals

Question 5

Starch and cellulose are both polymers of glucose. What is the main reason they have different properties?

Accepted Answer

They differ in the type of glycosidic linkages between glucose monomers

Question 6

Which of the following best explains why vegetable oil is liquid at room temperature while butter is solid?

Accepted Answer

Vegetable oil contains more double bonds in its fatty acid chains than butter

Question 7

Phospholipids are essential components of cell membranes because they:

Accepted Answer

Have both hydrophilic and hydrophobic regions, forming bilayers

Question 8

Which level of protein structure is directly determined by the sequence of amino acids in a polypeptide?

Accepted Answer

Primary structure

Question 9

A protein loses its functional three-dimensional shape when exposed to high heat or extreme pH. This process is called:

Accepted Answer

Denaturation

Question 10

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded

Question 11

Which of the following is NOT a component of a nucleotide?

Accepted Answer

Amino acid group

Question 12

The complementary DNA strand to $$5'	ext{ATAGCT}\ 3' is$$:

Accepted Answer

$$3'	ext{TATCGA}\ 5'$$

Question 13

Which type of bond connects amino acids together in the primary structure of a protein?

Accepted Answer

Peptide bond

Question 14

Which of the following is a real-life example of a protein acting as an enzyme?

Accepted Answer

Amylase breaking down starch in saliva

Question 15

Which of the following statements is true regarding the four classes of biological macromolecules?

Accepted Answer

Proteins are polymers of amino acids

Question 16

A dehydration reaction between two glucose molecules forms which disaccharide commonly found in plants?

Accepted Answer

Maltose

Question 17

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

Accepted Answer

Saturated fatty acids have only single bonds between carbon atoms

Question 18

Which molecule is the precursor for the synthesis of steroid hormones in animals?

Accepted Answer

Cholesterol

Question 19

Which of the following is a correct statement about hydrolysis?

Accepted Answer

It breaks polymers into monomers by adding a water molecule

Question 20

If a mutation changes the sequence of nucleotides in a gene, what is the most likely direct consequence?

Accepted Answer

The sequence of amino acids in the protein encoded by that gene may change

The Molecules of Cells: Structure and Function of Biological Macromolecules

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