Biochemistry Honors Review

Which organic compound is most likely found in waterproof coatings on leaves?

• Proteins

• Lipids

• Carbohydrates

• Nucleic acids

Enzymes belong to which macromolecule group?

• Proteins

• Lipids

• Carbohydrates

• Nucleic acids

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All of the following describe proteins EXCEPT:

• They transmit hereditary information.

• They act as enzymes.

• They are made from amino acids.

• They help regulate metabolism.

Which molecule carries genetic information in all living things?

• DNA

• Glucose

• Lipids

• Enzymes

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Why does each enzyme catalyze only one specific reaction?

• The shape of its active site fits only a certain substrate.

• Ribosomes transport enzymes to exact locations.

• Enzymes are flexible and change shape for every substrate.

• The nucleus assigns each enzyme to a reaction.

An enzyme active in the stomach functions best at pH 2. What does this indicate?

• It is a protein that requires an acidic environment.

• It is a carbohydrate that requires a basic environment.

• It is a lipid that requires a neutral environment.

• It is a nucleic acid that requires an acidic environment.

Enzymes affect cellular respiration by:

• Changing the location of reactions.

• Replacing oxygen as a reactant.

• Increasing reaction speed.

• Decreasing product pH.

Lactase is added to milk products to help people who are lactose intolerant. Lactase is which type of molecule?

• Enzyme

• Monosaccharide

• Hormone

• Fatty acid

When a protein is heated to very high temperatures, what happens?

• The protein denatures and loses its function.

• The protein becomes a carbohydrate.

• The protein mutates its DNA.

• The protein produces more enzymes.

Why are enzymes essential for most life processes?

• They supply water for reactions.

• They speed up reactions that would otherwise occur too slowly.

• They change reactants into lipids.

• They prevent waste buildup inside cells.