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A: Enzymes are usually much larger than their substrates.
B: Only a small portion of their structure makes up their active sites.

A : Enzymes are biochemical catalysts that speed up a chemical reaction by lowering the activation energy required for a reaction to proceed.
R : Enzyme either brings substrates together in the correct orientation or stress particular chemical bonds of a substrate. 

A: In competitive inhibition, the substrate and inhibitor cannot bind to the enzyme at the same time.
R: This type of inhibition can be overcome by sufficiently high concentrations of substrate(Vmax remains constant).

A: ATP is a nucleoside triphosphate.
R: It has three high energy bonds that can be broken to drive biochemical processes in the cell.

A: All amino acids share amphiprotic properties.
R: All amino acids contain amine and carboxylic acid functional groups.

A: Protein denaturation is always irreversible.
R: A denatured protein cannot be renatured.

A: There are nine essential amino acids which humans must obtain from their diet in order to prevent protein-energy malnutrition and resulting death.
R: Histidine is not synthesized in adults.

A: Strictly speaking proteins are made up of amino acid residues rather than amino acids.
R: When a peptide bond is formed, a water molecule is lost.

A: Animals use for long term energy storage.
R: The calorific value of fats is higher than that of carbohydrates and proteins.

A: Arachidonic acid can be regarded as a conditional essential fatty acid.
R: It does become essential if a deficiency in linoleic acid.

A: Cholesterol is a lipid required and biosynthesized by all animal cells.
R: It is an essential structural component of all animal cell membranes.

A: An agar plate is used to provide a growth medium using a mix of agar and other nutrients in which microorganisms, including bacteria and fungi, can be cultured and observed under the microscope.
R: As a gel, an agar or agarose medium is porous and therefore can be used to measure microorganism motility and mobility.

A: Some animals, particularly ruminants and termites, can digest cellulose.
R: They can produce cellulose.