AP BIOLOGY

LABORATORY REVIEW

ENZYME CATALYSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The rate of a chemical reaction in a cell is the measure of how
A
often the reaction occurs.
B
quickly the substrates are converted to product.
C
much energy must be added for the reaction to occur.
D
much activation energy is required for the reaction to occur.
Explanation: 

Detailed explanation-1: -To measure reaction rates, chemists initiate the reaction, measure the concentration of the reactant or product at different times as the reaction progresses, perhaps plot the concentration as a function of time on a graph, and then calculate the change in the concentration per unit time.

Detailed explanation-2: -The rate of reaction can be found by measuring the amount of product formed in a certain period of time. The mass of a solid product is often measured in grams, while the volume of a gaseous product is often measured in cm 3. The time period chosen may depend upon the rate of the reaction.

Detailed explanation-3: -A substrate is a molecule that an enzyme reacts with. The enzyme’s active site, or the location where weak bonds between the two molecules can form, is loaded with a substrate. An enzyme substrate complex is formed, and the enzyme’s pressures on the substrate drive it to react and become the planned reaction’s result.

Detailed explanation-4: -Enzymes in our bodies are catalysts that speed up reactions by helping to lower the activation energy needed to start a reaction. Each enzyme molecule has a special place called the active site where another molecule, called the substrate, fits.

There is 1 question to complete.