Organisation (B2)

Question 1

what are enzymes also known as

Answer 1

biological catalysts

Question 2

what is the name of the model related to enzymes

Answer 2

lock and key model

Question 3

the activity of enzymes is affected by

Answer 3

changes in temperature

pH

Question 4

organ system

Answer 4

where organs work totter to digest and absorb food

Question 5

what do digestive enzymes do

Answer 5

speed up conversion of large insoluble molecules (food) into small soluble molecules that can be absorbed into the bloodstream

Question 6

large changes in temp or pH can stop the enzyme from

Answer 6

working

Question 7

what is it called when an enzyme stops working

Answer 7

denature

Question 8

what happens when an enzyme denatures

Answer 8

changes shape so the substrate no longer fits in the active site

Question 9

where are carbohydrases (e.g. amylase) made

Answer 9

salivary glands
pancreas
small intestine

Question 10

what do carbohydrases do

Answer 10

break down carbohydrates to simple sugars

e.g amylase breaks down starch into glucose

Question 11

where are proteases made

Answer 11

stomach

pancreas

Question 12

what do proteases do

Answer 12

break down protein to amino acids

Question 13

where are lipase made

Answer 13

pancreas

Question 14

what does lipase do

Answer 14

break down lipids (fats) into glycerol and fatty acids

Question 15

where is bile made

Answer 15

liver

stored in gall bladder

Question 16

what does bile do

Answer 16

emulsifies lipids to increase surface area to increase to rate of lipid breakdown by lipase.
changes pH to neutral for lipase to work

Question 17

the products of digestion are used to build new

Answer 17

Carbohydrates
lipids
proteins

Question 18

how to test for sugars (glucose)

Answer 18

benedicts’ test

Question 19

what is the result if present sugars in the bendicts test

Answer 19

orange to brick red precipitate

Question 20

how to test for starch

Answer 20

iodine test

Question 21

what is the result if starch is present in the iodine test

Answer 21

turns black

Question 22

how to test for biuret

Answer 22

biuret reagent

Question 23

what is the result if biuret is present in the biuret reagent

Answer 23

mauve or purple solution

Question 24

example of a cell

Answer 24

muscle cell

Question 25

example of a tissue

Answer 25

muscle tissue

Question 26

example of an organ

Answer 26

the heart

Question 27

example of an organ system

Answer 27

the circulatory system

Question 28

what are cells

Answer 28

the basic building blocks of all living organisms

Question 29

what are tissues

Answer 29

a group of cells with a similar structure and function

Question 30

what are organs

Answer 30

Aggregations of tissues working together preforming a specific function

Question 31

what are organ systems

Answer 31

organs working together to form organ systems, which work together to form and organism

Question 32

describe the Benedict’s test

Answer 32

• place approximately 1ml of sample in clean test tube
• add 2ml of Benedict’s reagent
• heat solution in a boiling water bath for 3-5mins
• look for colour change

Question 33

describe the iodine test

Answer 33

add iodine solution and look for a colour change

if starch is present then it will turn blue/black

Question 34

describe the biuret reagent

Answer 34

• add you chosen solution to a test tube
• if using more than one label each test tube
• add 3 drops of biuret reagent to the solution and shake gently to mix
• note any colour changes
• if protein is present it will turn purple/pink