Question 1

Which of the following best describes the process of dehydration synthesis in biological systems?

Accepted Answer

It joins monomers together to form polymers by removing a water molecule.

Question 2

A triglyceride molecule is classified as a saturated fat if:

Accepted Answer

All of its fatty acid chains are straight and contain only single bonds between carbon atoms.

Question 3

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($-COOH$)

Question 4

Which of the following is NOT a difference between DNA and RNA?

Accepted Answer

DNA contains phosphate groups, while RNA does not.

Question 5

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 6

During hydrolysis, which of the following occurs?

Accepted Answer

A water molecule is added to break a polymer into monomers.

Question 7

Which of the following is a correct example of an unsaturated fat?

Accepted Answer

Olive oil

Question 8

A nucleotide is composed of which three components?

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 9

Which of the following best describes the role of an enzyme in a chemical reaction?

Accepted Answer

It lowers the activation energy and speeds up the reaction without being consumed.

Question 10

In an enzyme-catalyzed reaction, the substrate binds to which part of the enzyme?

Accepted Answer

The active site

Question 11

Which of the following is NOT one of the four major groups of organic compounds found in living organisms?

Accepted Answer

Minerals

Question 12

Which level of protein structure is directly affected when a protein is denatured by heat?

Accepted Answer

Secondary and tertiary structures

Question 13

Which functional group is characteristic of alcohols and is found in carbohydrates?

Accepted Answer

Hydroxyl group ($-OH$)

Question 14

Which of the following statements about enzyme specificity is correct?

Accepted Answer

Enzymes are specific to their substrates due to the shape of their active site.

Question 15

A student mixes a polysaccharide with water and an enzyme. After some time, only monosaccharides are detected. Which process has occurred?

Accepted Answer

Hydrolysis

Question 16

Which of the following is a correct example of a protein's quaternary structure?

Accepted Answer

The arrangement of four polypeptide subunits in hemoglobin

Question 17

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 18

Which of the following is the correct formula for a carboxyl group?

Accepted Answer

$-COOH$

Question 19

A patient is diagnosed with a genetic disorder that affects the sequence of amino acids in a protein. Which level of protein structure is directly impacted?

Accepted Answer

Primary structure

Question 20

Which of the following best describes the relationship between reactants and products in an enzyme-catalyzed reaction?

Accepted Answer

Reactants are converted into products by the enzyme, which remains unchanged.

General Biology Study Guide: Organic Molecules, Proteins, and Enzymes

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