B3

Question 1

What are the levels of organisation of cells?

Answer 1

Cells into tissues into organs into organ systems into organisms.

Question 2

What is starch made of?

Answer 2

Simple sugars such as glucose joined together chemically.

Question 3

How do you break down starch?

Answer 3

Enzymes catalyse the reaction with the site of mitochondria.

Question 4

Job of starch

Answer 4

Starch is a good carbohydrate and the most common source of energy for organisms.

Question 5

Job of protein

Answer 5

Proteins are needed for muscle formation as well as general body structure.

Question 6

Job of lipids (fats)

Answer 6

Lipids provide insulation and is the most efficient source of energy storage. Also vital for cell membranes.

Question 7

What are enzymes?

Answer 7

Enzymes are like pieces of a jigsaw made up of strings of amino acids.

Question 8

How do enzymes work?

Answer 8

Enzymes are like pieces of a jigsaw made up of strings of amino acids. These ‘pieces’ only allow specific substrate molecules to fit in the ‘active site’. The enzyme works as a catalyst for reactions in cells and can break a large molecule apart as well as bonding two small molecules together. This is using the ‘lock and key’ method to form into a enzyme-substrate complex.

Question 9

What are the 4 food tests?

Answer 9

Iodine for starch
Benedict’s solution for sugar
Ethanol for lipids (fats)
Biuret reagent for protein

Question 10

What is the digestive system?

Answer 10

The digestive system is a muscular tubes that squeezes your food through it. It starts at one end with your mouth, and finishes with the other at the end of your anus