Biological Molecules Quiz 2

Digestion, (A&B) in photosynthesis (C) chemical reaction. All chemical reaction in the body uses enzyme to speed up the rate. Uptake of water by osmosis is not considered a chemical reaction and osmosis is a passive process that does not require energy hence no enzymes are involved.

Carbohydrate is the main source of energy. Digestion of carbohydrate produces glucose that is used in respiration to provide energy for muscle contractions during the match.

An enzyme speed up the reaction by lowering the activation energy, making it easier for the reaction to occur. Since only the activation energy is lowered, the products form is not altered by the presence of enzyme. Enzymes remain chemically unchanged at the Adam reaction allowing them to be reused.

Glycogen is storage form of glucose in animal (for example human). Starch is the storage form of glucose in plants.

The active side of the lipase enzyme molecule has a specific shape into which only one kind of substrate (i.e. liquid) will fit. The lipid fits into the active site rather like a key fits into a lock to form an enzyme substrate complex which facilitates chemical reaction to breakdown lipids to fatty acid and glycerol. Enzyme is the lock, substrate is the key.

The graph of enzyme activity against pH is a symmetrical graph.

Protein changed the blue color of biuret reagent to violet.

Formation of carbohydrates and chloroplasts refers to photosynthesis which involves splitting of water and in the process glucose and oxygen is formed.

When the substrate molecule (key) fits into the active site, which has a specific shape on the enzyme molecule (lock), an enzyme-substrate complex is formed.

Deamination of excess amino acid in the liver produces urea which is excreted by the kidney. The amino part of amino acid molecule is converted to urea.