Question 1

Which of the following best describes a catabolic reaction pathway in cellular metabolism?

Accepted Answer

Breaks down large molecules into smaller ones, releasing energy often captured as ATP.

Question 2

Which statement about ATP is CORRECT?

Accepted Answer

ATP is produced on demand and used immediately by the cell for work.

Question 3

What is the main function of enzymes in biological systems?

Accepted Answer

Lower the activation energy required for chemical reactions to occur.

Question 4

Which of the following is TRUE regarding the 'lock and key' model of enzyme action?

Accepted Answer

The active site of the enzyme is complementary in shape to the substrate, allowing specific binding.

Question 5

Which process describes the removal of the terminal (last) phosphate group from ATP?

Accepted Answer

Dephosphorylation

Question 6

Anabolic reactions are also known as biosynthetic reactions. Which of the following is an example of an anabolic process?

Accepted Answer

Building proteins from amino acids.

Question 7

Which class of enzyme catalyzes the transfer of functional groups from one molecule to another?

Accepted Answer

Transferase

Question 8

Why is ATP considered 'metabolic money' in the cell?

Accepted Answer

It is used as a universal energy currency to power cellular work.

Question 9

Which of the following statements about enzyme-substrate complexes is CORRECT?

Accepted Answer

The substrate binds to the enzyme's active site, forming a temporary complex that facilitates the reaction.

Question 10

Which of the following is a reason why enzymes are effective in small amounts?

Accepted Answer

They are not changed or used up in the reaction, allowing them to catalyze multiple reactions.

Question 11

Which metabolic pathway is used for both breaking down and building substances in the cell?

Accepted Answer

Amphibolic pathway

Question 12

What is the role of the enzyme's active site?

Accepted Answer

It is the region where the substrate binds and the chemical reaction occurs.

Question 13

Which of the following is NOT a function of enzymes?

Accepted Answer

Being permanently changed by the reactions they catalyze.

Question 14

Which enzyme class is responsible for joining two molecules together, usually using energy?

Accepted Answer

Ligase

Question 15

If a cell loses its ability to make ATP, what is the most likely outcome?

Accepted Answer

It will die because ATP is required for cellular work.

Question 16

Which of the following best explains why enzymes do NOT facilitate reactions that would be chemically impossible without them?

Accepted Answer

Enzymes can only lower activation energy, not create new chemical possibilities.

Question 17

Which statement about collision theory and enzyme activity is CORRECT?

Accepted Answer

Molecules must collide in the correct orientation and with enough energy to react.

Question 18

Which of the following is an example of a hydrolase enzyme?

Accepted Answer

Lipase

Question 19

Which process is described by the equation $$ 	ext{ATP} ightarrow 	ext{ADP} + 	ext{P}_i $$?

Accepted Answer

Dephosphorylation

Question 20

Which of the following statements about metabolic pathways is TRUE?

Accepted Answer

Each pathway consists of a series of chemical reactions with a starting reactant, intermediates, and an end product.

Microbial Metabolism and Enzyme Function: Study Notes

Study Guide - Practice Questions