Quiz about Biomolecules and Enzymes STAAR Review

Question 1

Enzymes perform which of the following functions within living cells?

Accepted Answer

catalyzing chemical reactions

Answer

inhibiting the translation of proteins

Answer

providing structural stability

Answer

transmitting ultraviolet rays

Question 2

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

Accepted Answer

Enzyme decrease the activation energy of the reaction.

Answer

Enzymes increase the energy of the reactants.

Answer

Enzymes decrease the energy level of the products.

Answer

Enzymes reverse the direction of the reaction.

Question 3

An enzyme speeds up a reaction by

Accepted Answer

lowering the activation energy.

Answer

raising the activation energy.

Answer

releasing energy.

Answer

absorbing energy.

Question 4

The main function of a carbohydrate is

Accepted Answer

short term energy storage

Answer

long term energy storage

Answer

stores genetic information

Answer

regulates and controls all body proccesses

Question 5

For enzymes to work properly, they must specifically fit a specific substrate at the active site. What factors change the shape of an enzyme making it not work?

Accepted Answer

excessive heat

Accepted Answer

change in pH

Answer

amount of enzymes

Answer

amount of substrates

Question 6

What biomolecule do enzymes belong to?

Accepted Answer

Protein

Answer

Carbohydrate

Answer

Lipid

Answer

Nucleic Acid

Question 7

This model shows what feature that is important to understand about an enzyme?

Accepted Answer

How an enzyme's active site fits the substrate specifically

Answer

How an enzyme can bond two monomers to create a polymer

Answer

How an enzyme can break down a polymer molecule to form monomers

Answer

How any enzyme can break any kind of molecule

Question 8

The picture shown shows which class of biomolecule?

Accepted Answer

Carbohydrate

Answer

Protein

Answer

Nucleic Acid

Answer

Lipid

Question 9

Which of the following is NOT a function of lipids?

Accepted Answer

Short-term energy storage

Answer

Long-term energy storage

Answer

Insulation

Answer

Waterproof coverings

Question 10

Which describes the functions of proteins in living things?

Accepted Answer

structural, transport, signaling, catalysts, etc.

Answer

stores and transmits genetic information

Answer

stores energy and makes up cell membranes

Answer

quick energy and forming cell structure

Question 11

A sugar, a phosphate group, and a nitrogen base make up a:

Accepted Answer

Nucleotide

Answer

Protein

Answer

Carbohydrate

Answer

Nucleic Acid

Question 12

Which of these is NOT true?

Accepted Answer

Enzymes can only be used once in a chemical reaction.

Answer

Enzymes can denature (change shape) when the temperature gets too high.

Answer

Extreme pH can denature enzymes.

Answer

Enzymes speed up chemical reactions.

Question 13

How are carbohydrates and lipids related to each other?

Accepted Answer

They are both used for energy

Accepted Answer

They are both biomolecules

Answer

They are both made of amino acids

Answer

They are both used to keep the body warm

Question 14

Line B in the given graph represents the reaction with an enzyme added to substrates. How did the enzyme affect the reaction?

Accepted Answer

Lowered the activation energy

Answer

Increased the activation energy

Answer

Increase the energy change

Answer

Lowered the energy change

Question 15

At high temperatures enzyme activity declines because of:

Accepted Answer

Denaturation

Answer

Decreased Kinetic Motion

Answer

Increased H-Bonding

Answer

Dissociation of Ionic Compounds

Question 16

Choose 3 important characteristics for Nucleic acids

Accepted Answer

They are the only biomolecules that contain phosphorus

Accepted Answer

Their monomers are called nucleotides

Accepted Answer

They are what that genetic material is made from

Answer

They are the only biomolecules that contains nitrogen

Question 17

Proteins are made of monomers called ___________

Accepted Answer

Amino Acids

Answer

Nucleotides

Answer

Monosaccharides

Answer

Glycerol and fatty acids

Question 18

Which biomolecule makes up the cell membrane and hormones?

Accepted Answer

lipids

Answer

protein

Answer

nucleic acid

Answer

carbohydrate

Question 19

Which of these best represents a fatty acid molecule?

Accepted Answer

F

Answer

G

Answer

H

Answer

J

Question 20

What is the monomer of a carbohydrate?

Accepted Answer

monosaccharide

Answer

amino acid

Answer

polysaccharide

Answer

nucleotide

Question 21

Which of these best represents a fatty acid (lipid) molecule?

Accepted Answer

F

Answer

G

Answer

H

Answer

J

Question 22

Which of the following biomolecules is primarily responsible for catalyzing biochemical reactions?

Accepted Answer

C) Proteins

Answer

A) Carbohydrates

Answer

B) Lipids

Answer

D) Nucleic Acids

Question 23

What is the role of enzymes in biological systems?

Accepted Answer

B) They act as catalysts to speed up reactions

Answer

A) They provide energy for reactions

Answer

C) They are used as building blocks for cells

Answer

D) They store genetic information

Question 24

Which of the following factors does NOT affect enzyme activity?

Accepted Answer

D) Light intensity

Answer

A) Temperature

Answer

B) pH

Answer

C) Substrate concentration

Question 25

In an experiment, a student observes that an enzyme works best at a pH of 7. What can be concluded about the enzyme's activity at a pH of 3?

Accepted Answer

B) The enzyme will work slower or not at all

Answer

A) The enzyme will work faster

Answer

C) The enzyme will be unaffected

Answer

D) The enzyme will denature and work better

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