Digestion

Question 1

What is a positive Benedict’s test result?

Answer 1

Brick-red precipitate

Question 2

What is the product of digestion, glucose, used for?

Answer 2

To release energy in respiration

Question 3

What substance does Biuret Test test for?

Answer 3

Proteins

Question 4

What substance does Benedict’s Test test for?

Answer 4

Sugar

Question 5

What reagent should you use to test for lipids in food?

Answer 5

Ethanol Test

Question 6

How do enzymes behave at the optimum pH?

Answer 6

They work the fastest. Reaction is carried out at it’s highest rate

Question 7

What are the products of digeston, fatty acids and glycerol, used for?

Answer 7

To build new cell membranes and hormones

Question 8

What are the roles of bile?

Answer 8

To neutralise stomach acid so enzymes in the small intestine can work aster under alkaline conditions (their optimum pH). To break down large fat droplets into small ones by emulsification.

Question 9

What is the colour of Biuret solution?

Answer 9

Blue

Question 10

What is a positive Ethanal test result?

Answer 10

Cloudy emulsion

Question 11

Where are enzymes that are released into the small inestine released from?

Answer 11

The intestinal wall and the pancreas

Question 12

What is an enzyme?

Answer 12

A biological catalyst that speeds up a specifiy chemical reaction in cells. They remain unchanged at the end of a reaction

Question 13

Where are enzymes that are released into the stomach release from?

Answer 13

Stomach wall

Question 14

What is the product of digestion, amino acids, used for?

Answer 14

To build proteins like enzymes and antibodies

Question 15

What is starch broken down into?

Answer 15

Maltose

Question 16

What are enzymes made from?

Answer 16

Proteins

Question 17

What are the products of digestion used for?

Answer 17

To build new carbohydrates, lipids and proteins. Some glucose is also used in respiration

Question 18

What does the enzyme amylase break starch down into?

Answer 18

Maltose

Question 19

What is a negative Ethanal test result?

Answer 19

Colourless

Question 20

What enzyzme break proteins down?

Answer 20

Protease

Question 21

Where are enzymes that are released into the mouth released from?

Answer 21

The salivary glands

Question 22

What does the enzyme lipase break lipids down into?

Answer 22

Fatty acids and glycerol

Question 23

What enzyme breaks carbohydrates down?

Answer 23

Carbohydrase

Question 24

What is a negative Iodine test result?

Answer 24

Orange

Question 25

What is the function of the mouth?

Answer 25

To physically break down food into smaller pieces to speed up swallowing

Question 26

What does the enzyme protease break proteins down into?

Answer 26

Amino acids

Question 27

What does the enzyme amylase break down?

Answer 27

Starch

Question 28

How do enzymes behave at the optimum temperature?

Answer 28

They work the fastest. Reaction is carried out at it's highest rate

Question 29

What does the enzyme carbohydrase break carbohydrates down into?

Answer 29

Simple sugars

Question 30

What is the function of the liver?

Answer 30

To produce bile to help digest fats

Question 31

What is the function of the gall bladder?

Answer 31

To store the bile produced by the liver

Question 32

Which enzymes are released into the stomach?

Answer 32

Protease

Question 33

What is a negative Benedict's test result?

Answer 33

Blue

Question 34

What is the colour of Iodine solution?

Answer 34

Orange

Question 35

What are carbohydrates broken down into?

Answer 35

Simple sugars

Question 36

What are lipids broken down into?

Answer 36

Fatty acids and glycerol

Question 37

What is a negative Biuret test result?

Answer 37

Blue

Question 38

What substance does Iodine Test test for?

Answer 38

Starch

Question 39

What reagent should you use to test for starch in food?

Answer 39

Iodine Test

Question 40

What are proteins broken down into?

Answer 40

Amino acids

Question 41

What is peristalsis?

Answer 41

It is a muscle contracting to move food through the digestive system. It ignores gravity, so you can eat upside down fine.

Question 42

What is the function of the oesophagus?

Answer 42

For food to travel down the tube to the stomach, by peristalsis

Question 43

What reagent should you use to test for sugar in food?

Answer 43

Benedict's Test

Question 44

What does the enzyme lipase break down?

Answer 44

Lipids

Question 45

What is the function of the pancreas?

Answer 45

To make and release digestive enzymes to break down food

Question 46

What is the induced fit model for enzymes?

Answer 46

When substrate binds to the complementary active site of a specific enzyme, the active site and substrate slightly change shape to fit more perfectly together. This makes it easier for the substrate to be broken down into products

Question 47

How do enzymes behave at a high temperature?

Answer 47

Enzymes are denatured. Their active site changes shape so substrates can no longer bind to it. No reaction is carried out.

Question 48

How do enzymes behave at a low pH?

Answer 48

Enzymes are denatured. Their active site changes shape so substrates can no longer bind to it. No reaction is carried out.

Question 49

What is the function of the large intestine?

Answer 49

To reabsorb water into the body leaving a solid waste

Question 50

How do enzymes behave at a low temperature?

Answer 50

They are inactive. These is not enough energy for enzymes and substrates to collide. Reaction happens at a low rate.

Question 51

What is the colour of Benedict's solution?

Answer 51

Blue

Question 52

What is the function of the stomach?

Answer 52

To churn food and add digestive enzymes and acids

Question 53

What reagent should you use to test for proteins in food?

Answer 53

Biuret Test

Question 54

What enzyme breaks lipids down?

Answer 54

Lipase

Question 55

.What is the lock and key model for enzymes?

Answer 55

Substrate (key) binds to the complementary active site of a specific enzyme (lock) to form an enzyme-substrate complex. Substrate is broken down into products and products release from enzyme. Enzyme remains unchanged and can be used again

Question 56

How does an enzyme break down a substance?

Answer 56

A substrate binds to an enzyme forming an enzyme-substrate complex. The substrate is broken down into two products, whicha re the released from the enzyme. The enzyme can be used again to break down another substrate.

Question 57

What enzyme breaks starch down?

Answer 57

Amylase

Question 58

What is the colour of Ethanol solution?

Answer 58

Colourless

Question 59

How do enzymes behave at a high pH?

Answer 59

Enzymes are denatured. Their active site changes shape so substrates can no longer bind to it. No reaction is carried out.

Question 60

What does the enzyme protease break down?

Answer 60

Proteins

Question 61

What does the enzyme carbohydrase break down?

Answer 61

Carbohydrates

Question 62

Where is bile produced?

Answer 62

The liver

Question 63

What is a positive Iodine test result?

Answer 63

Blue black

Question 64

Which enzymes are released into the small intestine?

Answer 64

Carbohydrase, protease, lipase

Question 65

Where is bile stored?

Answer 65

The gall bladder

Question 66

What do enzymes do in digestion?

Answer 66

They break down large, insoluble molecules into smaller, soluble molecules that can be absorbed into the bloodstream

Question 67

What is a positive Biuret test result?

Answer 67

Purple

Question 68

Which enzymes are release into the mouth?

Answer 68

Amylase

Question 69

What is the function of the small intestine?

Answer 69

Where digestion occurs and small, soluble molecules are absorbed into the bloodstream

Question 70

What substance does Ethanol Test test for?

Answer 70

Lipids