Biochemistry Test

Which organic molecule would a long-distance runner most likely choose to eat two hours before a race?

• A protein, because it builds muscle mass.

• A lipid because it provides long term energy storage.

• A carbohydrate because it releases energy quickly.

• A protein, because it transports oxygen into the blood stream.

How are the functions of a carbohydrate and a lipid similar?

• Both are a source of energy.

• Both are replicated during meiosis.

• Both lower the activation energy of reactions.

• Both dissolve nutrients in the digestive system.

Why is the “lock and key” analogy often used to describe enzyme function?

• Each enzyme is the same as its substrate.

• Each enzyme will fit with only one specific kind of substrate.

• Each enzyme can only be used once in a reaction and cannot be used again.

• Each enzyme has its own active site that will not fit with other active sites.

Some individuals are unable to digest the lactose found in the milk of cows. The digestive systems of these individuals MOST likely lack which?

• a lipid that coats lactose molecules

• an ability to produce lactose internally

• an enzyme that catalyzes lactose breakdown

• a tolerance to lactose developed during childhood

Tags

NGSS.MS-LS1-7

Why are proteins important to the survival of animals?

• Proteins provide the body with quick-energy.

• Proteins provide insulation.

• Proteins provide genetic information to cells.

• Proteins provide muscle fiber for the body

Tags

NGSS.MS-LS1-2

What are the two factors that would cause an enzyme to denature?

• Substrates and products

• Proteins and fats

• Extreme pH and temperatures

• Lemons and Kiwis

Enzymes are considered to be 

• Lipids
• Carbohydrate
• Protein
• Nucleic Acid

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur

Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?

• reducing the number of products   
• reducing the activation energy
• increasing the temperature of the cell
• increasing the concentration of reactants 

Tags

NGSS.HS-PS1-4

What is structure A?

• Substrate
• Active site
• Enzyme
• Products

Tags

NGSS.HS-PS1-2