Human Digestive System, Enzymes, Food Tests😃

Question 1

Examples of large molecules found in the digestive system:

Answer 1

-starch
-proteins
-fats

Question 2

Examples of smaller digestive molecules:

Answer 2

-sugars
-amino acids
-glycerol
-fatty acids

Question 3

What can happen to these smaller digestive molecules?

Answer 3

They can be absorbed into the bloodstram

Question 4

What are the three types of digestive enzymes

Answer 4

-carbohydrases
-proteases
-lipases

Question 5

What does carbohydrase do

Answer 5

Convert carbohydrates to simple sugars

Question 6

What is an example of a carbohyrase

Answer 6

Amylase (converting starch to maltose)

Question 7

Where is amylase found

Answer 7

-the salivary gland
-the small intestine
-the pancreas

Question 8

What do proteases do?

Answer 8

Convert proteins to amino acids

Question 9

Where are proteases found?

Answer 9

-the stomach
-pancreas
-small intestine

Question 10

What do lipases do?

Answer 10

Convert lipids to glycerol and fatty acids

Question 11

Where are lipases found?

Answer 11

-pancreas
-small intestine

Question 12

What does bile do

Answer 12

Neutralise stomach acids and emulsify fats

Question 13

Where is bile produced

Answer 13

Liver

Question 14

Where is bile stored

Answer 14

Gall bladder

Question 15

Is bile alkaline/acidic

Answer 15

Alkaline

Question 16

What happens when the fat is emulsified

Answer 16

-broken down
-bigger surface area for lipase to work on
-digestion is quicker

Question 17

What do digestive enzymes do

Answer 17

Act as catalysts for the breakdown of different food molecules

Question 18

What enzyme is found in the tongue

Answer 18

-salivary glands
-produce amalyse

Question 19

What is produced in the liver

Answer 19

-bile
-neutralises acid
-emulsifies fat

Question 20

What enzyme is found in the stomach

Answer 20

-protease
-hydrochloric acid also produced to kill bacteria and get the right PH for protease to work

Question 21

where is bile stored

Answer 21

gall bladder

Question 22

what enzyme is produced in the pancreas

Answer 22

protease, lipase and amylase, into the small intestine

Question 23

What happens in the large intestine

Answer 23

Excess water is absorbed

Question 24

What enzyme is produced in the small intestine

Answer 24

Protese, amylase and lipase to complete digestion

Question 25

What happens in the rectum

Answer 25

Indigestible food is excreted

Question 26

What is the point of a food test

Answer 26

To identify what type of food molecule it contains

Question 27

How to make a food test

Answer 27

-break food up in pestle and mortar
-add distilled water
-Stir mixture to dissolve some food
-filter solution to get rid of solids

Question 28

What is the test for sugars

Answer 28

Benedict’s solution- only can be used for reducing sugars

Question 29

Explain the test for sugars

Answer 29

1) use 5cm^3 of food sample
2) water bath at 75°
3)add Benedicts solution
4)place test tube in water bath, 5 mins

Question 30

What colour will the Benedicts solution go if it contains a reducing sugar

Answer 30

Blue———->green,yellow,brick-red

Question 31

Test for starch

Answer 31

Iodine solution

Question 32

Method for test for starch

Answer 32

1) 5cm^3 of food sample
2)add iodine solution, shake

Question 33

What colour will the iodine solution go if it contains starch?

Answer 33

Brown/orange———>blue/black

Question 34

Test for proteins?

Answer 34

Biuret test

Question 35

Method for test for protein

Answer 35

-2cm^3 food sample
-2cm biuret solution gently shake

Question 36

What colour does the biuret solution go if it contains protein

Answer 36

Blue——-> purple

Question 37

Test for lipids

Answer 37

Sudan III test

Question 38

Method for test for lipids

Answer 38

-5cm^3 food sample, unfiltered
-use a pipette, 3 drops
-gently shake

Question 39

What colour does the Sudan III stain solution go?

Answer 39

Solution seperates, top layer goes red