Question 1

Which of the following best describes a macromolecule?

Accepted Answer

A large molecule consisting of thousands or millions of smaller subunits joined together, such as proteins or nucleic acids.

Question 2

Which process is responsible for joining monosaccharides to form polysaccharides, and what is a key byproduct of this reaction?

Accepted Answer

Dehydration synthesis; water is removed.

Question 3

A patient is unable to break down glycogen into glucose during fasting. Which process is most likely impaired?

Accepted Answer

Hydrolysis

Question 4

Which of the following statements about carbon is TRUE in the context of organic molecules?

Accepted Answer

Carbon forms strong covalent bonds, making it the backbone of all organic molecules.

Question 5

Which of the following is a correct example of a monosaccharide and its primary function in the human body?

Accepted Answer

Glucose; serves as a primary energy source.

Question 6

Which of the following best explains why unsaturated fats are liquid at room temperature?

Accepted Answer

They contain double bonds that create kinks, preventing tight packing.

Question 7

A scientist is analyzing a molecule with a backbone of three six-membered carbon rings and one five-membered carbon ring. Which class of macromolecule is this most likely to be?

Accepted Answer

Steroid

Question 8

Which of the following equations correctly represents the general formula for a monosaccharide?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 9

Which of the following best describes the role of phospholipids in the human body?

Accepted Answer

They form the primary structural component of cell membranes.

Question 10

A cell membrane is described as having a hydrophilic head and hydrophobic tails. Which macromolecule is being described, and what property does this confer to the membrane?

Accepted Answer

Phospholipid; allows selective permeability due to amphipathic nature.

Question 11

Which of the following is a correct pairing of a polysaccharide and its function?

Accepted Answer

Glycogen; energy storage in animals.

Question 12

During a dehydration synthesis reaction, which of the following occurs?

Accepted Answer

A water molecule is removed to form a bond between subunits.

Question 13

Which of the following best explains why cellulose cannot be digested by humans?

Accepted Answer

Humans lack the enzyme to break the specific glycosidic bonds in cellulose.

Question 14

Which of the following is a correct description of a glycoprotein's function in the human body?

Accepted Answer

It is involved in cell-cell recognition and communication.

Question 15

A triglyceride is formed from which combination of molecules?

Accepted Answer

One glycerol and three fatty acids via dehydration synthesis.

Question 16

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

Accepted Answer

Saturated fatty acids have only single bonds between carbons, while unsaturated fatty acids have one or more double bonds.

Question 17

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

Accepted Answer

They allow the formation of bilayers that make up cell membranes, enabling compartmentalization of cellular processes.

Question 18

Which of the following best explains the diversity among species at the molecular level?

Accepted Answer

Differences in their organic molecules, especially proteins and nucleic acids.

Question 19

Which of the following is a correct statement about the energy changes during hydrolysis and dehydration synthesis?

Accepted Answer

Dehydration synthesis requires energy input, while hydrolysis releases energy.

Question 20

A patient has a genetic disorder that prevents the formation of glycoproteins on cell membranes. Which of the following cellular processes would most likely be impaired?

Accepted Answer

Cell-cell recognition and communication.

Macromolecules: Structure, Classification, and Biological Roles

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