Enzymes and Their Role in Metabolism

This set of flashcards covers essential concepts regarding enzymes, their functions, effects on reactions, and the experimental procedures related to studying enzyme activity.

What are enzymes?

Enzymes are helper protein molecules that catalyze metabolic reactions.

Why are enzymes important?

All chemical reactions in living organisms require enzymes to work.

What is a catalyst?

A catalyst is a substance that speeds up the rate of a chemical reaction without being consumed or changed.

How do enzymes lower activation energy?

Enzymes reduce the activation energy of a reaction, facilitating faster chemical reactions.

What does it mean that enzymes are specific?

Each enzyme is specific to a particular reaction and has a shape that allows it to bind to its specific substrate.

What suffix is commonly found in enzyme names?

Enzyme names typically end with the suffix 'ase'.

What are the three types of enzymes based on their function?

1. Synthesis enzymes (build molecules) 2. Digestive enzymes (break down molecules) 3. Catalysts (speed up reactions)

What is the lock and key model?

The lock and key model explains how the specific shape of an enzyme (lock) allows it to fit only with a specific substrate (key).

What factors affect enzyme action?

Correct protein structure, temperature, and pH all impact enzyme activity.

What is denaturation in enzymes?

Denaturation refers to the alteration of an enzyme's structure due to changes in temperature or pH, which affects its function.

At what temperature and pH do most human enzymes operate optimally?

Most human enzymes operate best at a pH of 6-8 and a temperature of 37°C.

What is the principle of the amylase test using starch?

In solution, iodine reacts with starch to produce a blue-violet complex, indicating starch presence; amylase hydrolyzes starch forming maltose and fragments that do not react with iodine.

What is the aim of the concentration experiment with amylase?

To check the effect of concentration on the activity of salivary amylase and the rate of starch disappearance.

What is the hypothesis regarding salivary amylase concentration?

As the concentration of salivary amylase increases, the time of reaction decreases.

How is the effect of pH tested on amylase activity?

By preparing test tubes with different pH buffers, adding amylase and starch, and observing the reaction time using the iodine test.

What should be included in the results section of a lab report?

A table and graph showing the effect of concentration and pH on the rate of amylase's reaction.

What are some potential technical difficulties in an enzyme experiment?

Inconsistencies in enzyme concentration, timing errors, and variations in temperature or pH during the tests.

What kind of discussions are expected in the conclusion section?

Discuss the rate of amylase reaction, the correlation between enzyme concentration and reaction time, hypotheses outcomes, and any errors encountered.