Enzymes: Structure, Function, and Factors Affecting Activity

What is an enzyme?

Modified proteins that act as catalysts in biochemical reactions in living organisms.

How do enzymes function as catalysts?

They increase the rate of chemical reactions without being consumed or permanently altered.

What is activation energy (Ea)?

The initial investment of energy required to start a chemical reaction.

How do enzymes affect activation energy?

Enzymes lower the activation energy, speeding up the reaction rate by 10^6 to 10^14 times.

What is the active site of an enzyme?

A region on an enzyme that binds to a substrate during a reaction.

What is denaturation in the context of enzymes?

The distortion of an enzyme's active site due to changes in environmental conditions, leading to loss of function.

What factors can cause denaturation of enzymes?

Extreme pH levels and high temperatures.

How does temperature affect enzyme activity?

Low temperatures decrease activity, while high temperatures can lead to denaturation.

What is the optimal pH for most enzymes?

Neutral pH (around 7) is usually optimal, but some enzymes function best in acidic or basic conditions.

How does enzyme concentration affect productivity?

Increasing enzyme concentration increases productivity.

What happens to enzyme activity over time?

Time allows for more reactions to occur, increasing overall productivity.

What is the formula structure for enzyme reactions?

Substrate is on the left side, enzymes are above the arrow, and products are on the right.

What suffix is commonly used for enzyme names?

The suffix '-ase' is used for enzymes, except for some proteolytic enzymes which use '-in'.

Give an example of an enzyme and its reaction.

Catalase breaks down hydrogen peroxide into water and oxygen.

What is the role of rennin?

Rennin is an enzyme that acts in acidic environments, such as the stomach.

What happens to enzymes in unfavorable pH or temperature conditions?

They may denature, losing their functional shape and activity.

What is a substrate in enzymatic reactions?

The substance that an enzyme acts upon to produce a product.

What is a product in the context of enzyme reactions?

The substance produced as a result of the enzymatic reaction.

What is the significance of enzyme specificity?

Enzymes are selective for a single substrate, ensuring precise biochemical reactions.

What is the effect of low temperatures on enzyme activity?

Low temperatures slow down enzyme activity or render them inactive until optimal conditions are met.

What is the relationship between enzyme activity and pH?

Extreme pH levels can denature enzymes, while neutral pH is usually optimal.