Question 1

What are enzymes made of?

Accepted Answer

proteins

Answer

carbohydrates

Answer

nucleic acids

Answer

lipids

Question 2

What do enzymes do in chemical reactions?

Accepted Answer

speed up reactions by lowering activation energy

Answer

raise activation energy

Answer

stop reactions

Answer

store energy

Question 3

What is a catalyst?

Accepted Answer

a chemical that speeds up a reaction without being used up

Answer

a molecule that slows reactions

Answer

a cell part that releases energy

Answer

a protein that breaks down

Question 4

What part of the enzyme binds to the substrate?

Accepted Answer

active site

Answer

protein pocket

Answer

enzyme site

Answer

binding ring

Question 5

What is the substrate in an enzyme reaction?

Accepted Answer

the molecule that fits into the enzyme and reacts

Answer

the new substance made

Answer

a chemical messenger

Answer

the helper protein

Question 6

What is the product in an enzyme reaction?

Accepted Answer

the new substance made after the reaction

Answer

the substrate

Answer

the catalyst

Answer

the enzyme before the reaction

Question 7

What happens when an enzyme denatures?

Accepted Answer

it changes shape and can no longer work

Answer

it speeds up

Answer

it produces more substrate

Answer

it doubles in size

Question 8

Which factor can cause an enzyme to denature?

Accepted Answer

extreme pH or temperature

Answer

high pressure

Answer

low oxygen

Answer

lack of light

Question 9

What happens to the rate of reaction when enzyme concentration increases?

Accepted Answer

it increases until all substrates are used

Answer

it reverses

Answer

it stops completely

Answer

it slows down

Question 10

What happens when all enzyme active sites are occupied?

Accepted Answer

the reaction rate levels off

Answer

it melts

Answer

it becomes acidic

Answer

the enzyme breaks down

Question 11

How does temperature affect enzyme activity?

Accepted Answer

too hot denatures, too cold slows down

Answer

makes it faster no matter what

Answer

always denatures it

Answer

does nothing

Question 12

What pH level do most human enzymes work best at?

Accepted Answer

around 7

Answer

2

Answer

10

Answer

5

Question 13

What is activation energy?

Accepted Answer

the minimum energy needed to start a reaction

Answer

energy stored in products

Answer

the maximum energy released

Answer

total energy of reaction

Question 14

How do enzymes affect activation energy?

Accepted Answer

they lower it

Answer

they stop it completely

Answer

they have no effect

Answer

they increase it

Question 15

What is meant by 'biological catalyst'?

Accepted Answer

an enzyme that speeds up reactions in living things

Answer

a type of sugar

Answer

a molecule that slows reactions

Answer

a kind of hormone

Question 16

What type of reaction breaks molecules apart?

Accepted Answer

decomposition reaction

Answer

oxidation

Answer

exchange reaction

Answer

neutralization

Question 17

What type of reaction combines molecules?

Accepted Answer

synthesis reaction

Answer

decomposition

Answer

exchange reaction

Answer

neutralization

Question 18

What happens to enzymes after a reaction?

Accepted Answer

they are reused

Answer

they change permanently

Answer

they are destroyed

Answer

they turn into products

Question 19

Why do enzymes only fit one substrate?

Accepted Answer

their active site shape is specific

Answer

they share electrons

Answer

it absorbs energy

Answer

it can change shapes

Question 20

What is the 'lock and key' model used to describe?

Accepted Answer

how enzymes and substrates fit together

Answer

how enzymes are digested

Answer

how products break down

Answer

how proteins are made

Question 21

What is an example of a substrate?

Accepted Answer

sucrose in the sucrase reaction

Answer

oxygen

Answer

glucose

Answer

enzyme

Question 22

What are the reactants in a chemical reaction?

Accepted Answer

the starting materials

Answer

the end result

Answer

the middle process

Answer

the energy required to start it

Question 23

What are the products in a chemical reaction?

Accepted Answer

the substances made after the reaction

Answer

the catalysts

Answer

the enzymes

Answer

the reactants

Question 24

What can slow down enzyme activity?

Accepted Answer

low temperature or pH imbalance

Answer

light exposure

Answer

oxygen levels

Answer

blood sugar

Question 25

What does it mean if an enzyme is denatured?

Accepted Answer

its active site is destroyed

Answer

it works faster

Answer

it bonds permanently

Answer

it creates more enzymes

Question 26

What is an example of an enzyme?

Accepted Answer

amylase or sucrase

Answer

water

Answer

glucose

Answer

oxygen

Question 27

What do enzymes mainly control in the body?

Accepted Answer

the speed of chemical reactions

Answer

blood flow

Answer

water balance

Answer

temperature

Question 28

What is the term for the molecule that an enzyme acts upon?

Accepted Answer

substrate

Answer

reactant

Answer

enzyme

Answer

product

Question 29

What happens when the enzyme-substrate complex forms?

Accepted Answer

the reaction takes place

Answer

it multiplies

Answer

it denatures

Answer

it freezes

Question 30

What happens after the enzyme releases the product?

Accepted Answer

it returns to normal and can react again

Answer

it breaks apart

Answer

it changes shape permanently

Answer

it becomes inactive

Related quizzes

Related quizzes