Lock and Key Interactions in Biological Systems Quiz

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10 Questions

What is the main purpose of enzymes?

To speed up chemical reactions

Which enzyme helps break down lactose found in milk?


What is the function of Aldehyde dehydrogenase (ALDH) in the body?

Helps break apart the alcohol molecule

Where does amylase help change starches into sugars?

In the saliva

What is the role of Helicase in the body?

Unravels DNA

What is the function of maltase?

Breaking down maltose into glucose

What do trypsin enzymes break down in the small intestine?

Proteins into amino acids

What is the role of acetylcholinesterase?

Breaking down the neurotransmitter acetylcholine in nerves and muscles

What is the substrate for lactase?


What does helicase enzymes do?

Unravel DNA

Study Notes

Enzyme Functions

  • The main purpose of enzymes is to facilitate biochemical reactions in the body.

Lactose Breakdown

  • Lactase is the enzyme that helps break down lactose found in milk.

Aldehyde Dehydrogenase (ALDH)

  • Aldehyde dehydrogenase (ALDH) in the body helps convert aldehydes into acids.

Carbohydrate Breakdown

  • Amylase helps change starches into sugars in the salivary glands and pancreas.

DNA Unwinding

  • Helicase plays a crucial role in unwinding DNA double helix structures during DNA replication.

Maltose Breakdown

  • Maltase is the enzyme responsible for breaking down maltose into glucose molecules.

Protein Breakdown

  • Trypsin enzymes break down proteins into smaller peptides and amino acids in the small intestine.


  • Acetylcholinesterase (AChE) breaks down the neurotransmitter acetylcholine, terminating its signal transmission.

Lactose Breakdown

  • Lactose is the substrate for lactase, which breaks it down into glucose and galactose.

DNA Replication

  • Helicase enzymes unwind DNA double helix structures, allowing for DNA replication to occur.

This quiz explores the concept of lock and key interactions, drawing parallels between the process of unlocking a lock with a key and the interaction of enzymes with specific substrates in biological systems. It also includes a mix and match section related to enzymes and the processes they catalyze.

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