Enzymes and Metabolism

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What is the primary function of enzymes in the human body?

To regulate body temperature

To build and break down substances (correct)

To convert nutrients into energy

To communicate with each other

How have humans utilized enzymes for thousands of years?

To manufacture medicine

To develop biotechnology

To prepare and preserve foods (correct)

To create cosmetics

What is the name of the enzyme responsible for coagulating milk in a calf's stomach?

Lactase

Protease

Amylase

Rennin (correct)

What is the primary result of the action of rennin on milk?

Milk separates into curds and whey Signup and view all the answers

How many different enzymes have been identified in the human body?

Over 3,000 Signup and view all the answers

What is the role of certain enzymes in the human body during injury or illness?

They aid in recovery Signup and view all the answers

What innovation in transportation allowed for the year-round availability of fresh fruits and vegetables?

Refrigerated rail car Signup and view all the answers

What is the primary purpose of enzymes in living organisms?

To speed up chemical reactions Signup and view all the answers

What process uses the principles of heat transfer in reverse to preserve food?

Freeze-drying Signup and view all the answers

What is the benefit of freeze-dried foods for hikers and campers?

They are lighter to carry Signup and view all the answers

At what temperature does water convert from a liquid to steam at atmospheric pressure?

212 °F Signup and view all the answers

What is the role of enzymes in the digestive system?

To make food usable by the body Signup and view all the answers

What is the primary reason why drying food prevents spoilage?

It removes the moisture necessary for bacterial growth Signup and view all the answers

How does salt help in preserving food?

It pulls moisture from the bacteria through osmosis, killing them Signup and view all the answers

What was the motivation behind the development of canning as a food preservation method?

To provide food for soldiers during wartime Signup and view all the answers

Why are dried and salted foods still popular today?

Because people enjoy the taste and texture of these foods Signup and view all the answers

What was the role of osmosis in preserving food with salt?

It pulls moisture from the bacteria, killing them Signup and view all the answers

What was the outcome of the experimentation with food preservation in ancient times?

People learned to preserve foods through drying, salting, and pickling Signup and view all the answers