Biochemistry Test Review

Enzymes act as catalysts by

• lowering the speed at which the reaction takes place.

• increasing the amount of time it takes for the reaction to take place.

• lowering the activation energy thereby speeding up the reaction.

• raising the activation energy thereby slowing down the reaction.

The part of the enzyme where the substrate binds is called the

• large subunit

• inhibitor

• catalyst

• active site

Which of these represents a sugar molecule?

• 
• 
• 
• 

Each 3 part unit of DNA is composed of a sugar, phosphate, and a nitrogen base. What is this unit called?

• Copper sulphate

• DNA code word

• RNA synthesis

• nucleotide

Although there are a limited number of amino acids, many different types of proteins exist because the

• size of a given amino acid can vary

• chemical composition of a given amino acid can vary

• sequence and number of amino acids are different

• same amino acid can have many different properties

A macromolecule, or _____________, is a large molecule like a protein, a carbohydrate, a lipid, or a nucleic acid needed by living things.

• monomer

• polymer

• molecule

• element

The largest carbohydrate is a polymer composed of many monosaccharides bonded together called a

• simple starch

• disaccharide

• monosaccharide

• polysaccharide

A_______________ is the small subunits that bond together to create larger polymers or macromolecules.

• elements

• polymer

• monomer

• atoms

A sugar molecule of sucrose is an example of which macromolecule?

• carbohydrate

• protein

• lipid

• nucleic acid

Triglycerides are created when a glycerol molecule is bonded to three ____________ chains.

• fatty acid

• amino acid

• sugar

• nucleic acid