Question 1

Which of the following best describes the primary function of carbohydrates in plants?

Accepted Answer

Energy source and structural support

Question 2

A molecule with the formula $$C_{6}H$$_{12}$$O_{6}$ is most likely a:

Accepted Answer

Monosaccharide

Question 3

Which organic molecule is primarily responsible for making up the cell membrane and providing structural support?

Accepted Answer

Lipids

Question 4

A student is analyzing a molecule that contains an amine group and a carboxyl group attached to a central carbon. This molecule is most likely a:

Accepted Answer

Amino acid

Question 5

Which of the following is a correct match between a biomolecule and its monomer?

Accepted Answer

Lipid – Fatty acid tail

Question 6

Which of the following best explains why saturated fatty acids are solid at room temperature?

Accepted Answer

They have single bonds, allowing molecules to pack closely together

Question 7

A mutation causes a protein to lose its tertiary structure. Which property is most likely affected?

Accepted Answer

The protein's enzymatic activity and function

Question 8

Which of the following is a pentose monosaccharide found in nucleic acids?

Accepted Answer

Ribose

Question 9

Which statement best describes the difference between DNA and RNA based on their sugar component?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose

Question 10

Which of the following molecules contains an aldehyde group and is classified as a monosaccharide?

Accepted Answer

Aldose

Question 11

A patient is diagnosed with a disorder affecting the storage of sugar in their muscles. Which molecule is most likely involved?

Accepted Answer

Glycogen

Question 12

Which of the following is NOT a function of proteins?

Accepted Answer

Energy storage in plants

Question 13

Which of the following best describes the quaternary structure of a protein?

Accepted Answer

Several tertiary structures put together

Question 14

Which of the following organic molecules is most directly involved in hereditary information transfer?

Accepted Answer

Nucleic acids

Question 15

Which of the following is a correct example of a carbohydrate?

Accepted Answer

Glucose

Question 16

Which of the following best explains why lipids are efficient for long-term energy storage?

Accepted Answer

They have many carbon-hydrogen bonds, storing more energy per gram

Question 17

Which of the following is a correct match between a biomolecule and its function?

Accepted Answer

Proteins – Communication and transport

Question 18

A scientist discovers a molecule with a 1:2:1 ratio of carbon, hydrogen, and oxygen. Which class of organic molecules does this most likely belong to?

Accepted Answer

Carbohydrates

Question 19

Which of the following is a correct description of a nucleotide?

Accepted Answer

Contains a 5-carbon sugar, phosphate group, and nitrogenous base

Question 20

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

Accepted Answer

They make up the cell membrane and provide structural support

Organic Molecules: Structure, Function, and Examples

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