TEKS 9A

An enzyme serves as a place where a chemical reaction can occur because-

• the enzyme is a substrate.
• the enzyme is one of the reactants in the reaction.
• the charge on the enzyme's active site is the same as the charge on the substrates.
• the shape of the substrates fits perfectly into the shape of the enzyme's active site.

An enzyme acts as a catalyst to a chemical reaction by

• lowering the activation energy needed to get the reaction started.
• making one of the substrates needed for the reaction.
• regulating the temperature at which the reaction takes place.
• regulating the pH at which the reaction takes place.

How do enzymes control chemical reactions in the body?

• Enzymes speed up chemical reactions.
• Enzymes slow down chemical reactions.
• Enzymes increase the activation energy of a reaction.
• Enzymes inhibit the catalysts of a reaction.

Tags

NGSS.HS-LS1-7

In addition to serving as waterproof coverings or as parts of biological membranes, lipids

• store glucose and other sugars.
• store energy.
• transmit hereditary information.
• supply energy for chemical reactions.

Which of the following would be considered the most important elements of life?

• potassium, nitrogen, phosphorus
• carbon, hydrogen, oxygen
• hydrogen, oxygen, helium
• oxygen, nitrogen, magnesium

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-6

NGSS.HS-LS2-5

Which of the following describes the four major groups of biomolecules found in living things?

• Carbohydrates, lipids, nucleic acids, and proteins
• Carbohydrates, amino acids, proteins, and nitrogen bases
• Carbohydrates, monomers, polymers, and proteins
• None of the other answers are correct.

Storing and transmitting genetic material is the function of which biomolecule?

• Nucleic acids
• Protiens
• Lipids
• Carbohydrates

Enzymes are proteins that are found in cells. What is their role?

• They speed up chemical reactions in cells.
• They lower the activation energy needed for some reactions.
• They regulate the absorption of energy in chemical reactions.
• All the other answers are correct.

Enzymes provide a site where reactants called substrates can be brought together in an enzyme-catalyzed reaction. The site is called the

• enzyme substrate complex.
• reaction site.
• active site.
• lock and key.

An inhibitor such as pH, Temperature, or molecules can denature, or change the shape of a protein. How might these inhibitors affect the function of an enzyme? 

• A new enzyme may be required to speed up the reaction.
• The enzyme may no longer be able to function for the substrate as a catalyst.
• The enzyme and substrate may no longer fit together so the enzyme cannot speed up the reaction.
• All the other answers are correct.