Exploring the World of Enzymes

What is an enzyme and what is its primary role in the human body?

• An enzyme is a biological catalyst that speeds up chemical reactions in the human body.

• An enzyme is a mineral that helps with muscle contraction.

• An enzyme is a protein that stores energy in cells.

• An enzyme is a type of hormone that regulates body temperature.

Enzymes are biological catalysts. What does it mean for a substance to act as a catalyst in a chemical reaction?

• A catalyst slows down a chemical reaction without being altered.

• A catalyst is consumed during the reaction and cannot be reused.

• A catalyst changes the products of a chemical reaction permanently.

• A catalyst speeds up a chemical reaction without being consumed.

What type of molecule makes up most enzymes, and what are the basic building blocks of that molecule?

• Nucleic acids; nucleotides

• Carbohydrates; sugars

• Proteins; amino acids

• Lipids; fatty acids

Explain what is meant by the 'active site' of an enzyme and how it relates to the enzyme's function.

• The active site is the region of an enzyme where substrate binding occurs, enabling the enzyme to catalyze biochemical reactions.

• The active site is where the enzyme is produced, affecting its overall stability.

• The active site is a structural feature that prevents substrate interaction entirely.

• The active site is the part of the enzyme that determines its color and appearance.

Describe the 'lock and key' model of enzyme activity. How does a substrate fit into an enzyme?

• The substrate fits into the enzyme's active site like a key fits into a lock, ensuring specificity in enzyme-substrate interactions.

• Substrates bind randomly to any part of the enzyme, leading to varied interactions.

• The active site of the enzyme is a general area where substrates can attach without specificity.

• The enzyme changes shape to accommodate any substrate, allowing for flexibility in binding.

How does temperature affect enzyme activity? What happens to an enzyme when the temperature gets too high?

• When the temperature gets too high, the enzyme denatures and loses its activity.

• The enzyme becomes more active and speeds up reactions.

• Temperature has no effect on enzyme function at all.

• Enzymes work best at extremely high temperatures.

What is the term used to describe the process where an enzyme loses its shape and stops functioning due to extreme heat or pH changes?

• Coagulation

• Inhibition

• Activation

• Denaturation

Give two examples of enzymes found in the human digestive system and describe what each one does.

• Lipase: Breaks down sugars into starches.

• 1. Amylase: Breaks down carbohydrates into simpler sugars. 2. Pepsin: Breaks down proteins into smaller peptides.

• Cellulase: Breaks down vitamins into minerals.

• Lactase: Breaks down fats into fatty acids.

How does pH level affect the way enzymes work? Provide an example of an enzyme that works best in an acidic environment.

• Catalase

• Amylase

• Pepsin

• Lipase

Why are enzymes considered specific in their function? Can one enzyme break down all types of substances in the body?

• No, one enzyme cannot break down all types of substances in the body.

• Yes, one enzyme can break down all substances.

• Enzymes can work on multiple types of substances.

• All enzymes have the same function in the body.