Biomolecule terms 2 - Enzymes

Multiple Choice

Enzymes are composed of which of the following monomers? 

• amino acids

• proteins

• nucleotides

• monosaccharides

Multiple Choice

An enzyme speeds up a reaction by

• lowering the activation energy.

• raising the activation energy.

• releasing energy.

• absorbing energy.

Multiple Choice

What makes an enzyme specific?

• Size

• Shape

• Name

• Location it is found in

Multiple Choice

An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 

• true

• false

Multiple Choice

Enzymes are able to speed up chemical reactions because they - 

• increase the temperature inside the cell

• reduce the friction between the reactants

• make the raw materials more chemically reactive

• lower the activation energy of the reaction

Multiple Choice

What 3 letters do enzymes typically end in?

• -ose

• -ase

• -ese

• -tic

Multiple Choice

What is the primary role of enzymes inside of living cells? 

• store genetic information

• store energy

• they help fight infections

• speed up chemical reactions 

Multiple Choice

Based on their role in the cell, enzymes can also be classified as –

• inhibitors

• catalysts

• sources of energy

• vitamins

Multiple Choice

Which model will temporarily change shape when stimulated by its proper substrate.

• Induced fit model

• Lock and Key model

• both

• neither

Multiple Choice

Each enzyme only has 1 substrate that will fit its active site.  What is this called?

• reusable

• catalyst

• specific

• fragile

Multiple Choice

Identify what is labeled with the letter D

• active site

• enzyme

• substrate

• products

Multiple Choice

In the diagram, what is letter A? 

• product

• substrate

• enzyme-substrate complex

• active site

13.

ENZYME INHIBITORS

•

A substance that prevents

the substrate from

interacting with the

enzyme.

8

Multiple Choice

Any substance that is acted upon by an enzyme is called a(n)?

• Coenzyme

• Substrate

• Vitamin

• Polypeptide

Multiple Choice

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

• Reactants

• Products

• Atoms

• Catalysts

Multiple Choice

Letter B...

• active site

• enzyme

• substrate

• products

Multiple Choice

Enzymes have an area where reactants called substrates can be brought together in an enzyme-catalyzed reaction. This area on the enzyme is called the

• enzyme substrate complex.

• reaction site.

• active site.

• lock and key.

Multiple Choice

After the enzyme and substrate bind together and perform the reaction, what does the substrate become?

• another substrate

• an enzyme

• a product

• an active site

Multiple Choice

Letter E...

• active site

• enzyme

• substrate

• products

Multiple Choice

Enzymes need certain environmental conditions in order to function properly.  What happens when enzymes are heated to a high temperature?

• they die

• they denature

• they change their amino acid sequence

• they work better

Multiple Choice

What is an inhibitor?

• the region of an enzyme that attaches to a substrate

• a change in the shape of a protein

• substance that can bind to an enzyme and prevent the substrate from binding

• macromolecules that contain carbon, hydrogen, oxygen, and nitrogen

Multiple Choice

what part do the competitive inhibitors attach to?

• subtrate

• active site

• somewhere other than enzyme

Multiple Choice

Non-competitive inhibitors block the active site

• true

• false

Multiple Choice

The role of enzymes in the cell is best summarized by which of the following statements?

• Enzymes control the rate and process of chemical reactions in our body by helping break and form chemical bonds

• Enzymes carry the genetic information needed for our cells to function.

• Enzymes send electrical signals through the bodies of multicellular organisms.

• Enzymes are the main energy storage molecules within our cells.

Multiple Choice

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  

• This enzyme works best in highly acidic environments
  

• The enzyme’s activity increases as pH increases 7.0 to 9.0
  

• The enzyme’s activity is greater around pH of 8.0 .
  

Multiple Choice

Sucrase has an optimum temperature of 37 C and an optimum pH of 6.2. What would happen if the pH changed to 3?

• Sucrase would continue to work the same

• The reaction sucrase catalyzes would speed up

• The reaction sucrase catalyzes would slow down

Multiple Choice

The enzyme amylase helps the body breakdown starch in food and functions optimally at body temperature (37 C). A young child runs a fever of 40C for 24 hours.  Predict the effect this may have on his digestion.

• Digestion will increase because starch molecules are colliding faster with the enzyme.

• Digestion will increase because enzyme activity improves at higher temperature.

• Digestion will decrease because starch molecules are colliding faster with the enzyme.

• Digestion will decrease because the shape of the enzyme is altered past optimal temperature.

Multiple Choice

Enzymes are an example of

• Lipids

• Carbohydrate

• Protein

• Nucleic Acid

Multiple Choice

In a chemical reaction, ________ are what you have at the end

• Products

• Molecules

• Reactants

• Substances

Multiple Choice

Each enzyme only has 1 substrate that will fit its active site.  What is this called?

• reusablility

• denaturation

• specificity

• fragility

Multiple Choice

Based on the graph, what is the optimal temperature for this enzyme? 

• 15^oC

• 40^oC

• 30^oC

• 35^oC