yeast

Question 1

how many cells does yeast have?

Answer 1

single cellular

Question 2

yeast contains what?(5 things)

Answer 2

nucleus, mitochondria, cell wall, cell membrane and cytoplasm

Question 3

can they create their own food?

Answer 3

no

Question 4

where do they get their food?

Answer 4

chemicals in the environment around them

Question 5

what do chemicals provide the yeast?

Answer 5

energy

Question 6

what can yeast be used for?

Answer 6

bread, beer/wine, kefir, food colouring and flavouring

Question 7

aerobic respiration formula?

Answer 7

food + oxygen → carbon dioxide + water +lots of energy (aerobic)

Question 8

anaerobic respiration?

Answer 8

food → carbon dioxide + ethanol(alcohol) + a little energy

Question 9

how streak plate experiments was done?

Answer 9

loop placed into ethanol to sterilise and then flamed, once cool loop was placed into yeast and streaks where drawn

Question 10

result of streak plate experiment

Answer 10

the lines became less concentrated as they were drawn around the plate

Question 11

what does the rising of dough involve?

Answer 11

yeast

Question 12

what does yeast produce?

Answer 12

bubbles of carbon dioxide

Question 13

what happens to the carbon dioxide ?

Answer 13

the bubbles get trapped and the dough rises

Question 14

what is the most reactive yeast?

Answer 14

fresh yeast

Question 15

what is the least reactive yeast?

Answer 15

boiled yeast?

Question 16

what is the fermentation equation?

Answer 16

Food —yeast → alcohol + carbon dioxide + energy

Question 17

when fermentation has yeast what happens to the alcohol volume, biological indicator and temperature?

Answer 17

alcohol present, bicarbonate indicator=orange/yellow, temperature increases slightly(+ Energy produced)

Question 18

brewing process

Answer 18

Milling → Mashing → lautering → boiling → whirlpooling → cooling → fermenting → maturing → filtering → packaging → distribution

Question 19

what are enzymes made to prevent?

Answer 19

reactions happening quickly so a cell doesn’t die

Question 20

what are enzymes made out of?

Answer 20

proteins

Question 21

what do enzymes do?

Answer 21

speed up cellular reactions without being used up

Question 22

what is another name for enzyme ls?

Answer 22

biological catalyst

Question 23

what are Chemicals that enzymes act on are called?

Answer 23

substrates

Question 24

what are the substance produced by chemicals acting on enzymes?

Answer 24

product

Question 25

the part of an enzyme that substrates attach too??

Answer 25

active sight

Question 26

As a word formula for chemical reactions

Answer 26

Substrates (things that mix Or break up) Active Site –enzyme→ (won't get used up) Enzyme + Products products (things you make)

Question 27

what was the liver experement?

Answer 27

testing liver and hydrogen peroxide to see if oxygen will be created faster using the enzymes in the liver

Question 28

result of liver experement?

Answer 28

the enzyme from the liver speeds up this reaction and we find this out by the present oxygen relighting a glowing splint

Question 29

what do enzymes do?

Answer 29

speed up the breakdown of complex molecules

Question 30

what is the breakdown of molecules called?

Answer 30

degradation

Question 31

where can degradation take place?

Answer 31

digestion of food

Question 32

what is starch?

Answer 32

complex and insoluble

Question 33

what can startcb be broken down by?

Answer 33

analyse

Question 34

what happens when start h is broken down?

Answer 34

it becomes smaller soluble maltose

Question 35

what is the abbreviation for degradation?

Answer 35

SAM

Question 36

describe how milk is pasteurised?

Answer 36

.

Question 37

how do scientists use cells?

Answer 37

products that are useful for us

Question 38

what are aseptic techniques?

Answer 38

gloves, washing hands, tying hair back, clean work surface, wear masks

Question 39

what is in full fat milk?

Answer 39

vitamins, minerals, sugars, proteins and fats

Question 40

fats give us what?

Answer 40

energy and insulation

Question 41

what does heat treatment to milk do?

Answer 41

helps it to keep for longer

Question 42

what types of heat treaded milk are there?

Answer 42

pasteurised and UHT

Question 43

what types of milk are there?

Answer 43

full fat, semi-skimmed milk, skimmed milk, evaporated milk,

Question 44

what is evaporated milk?

Answer 44

heated to remove about half the water making it more concentrated, this preserves it because heating it kills all bacteria

Question 45

what milk has the lowest fat content?

Answer 45

skimmed

Question 46

what type of milk has the highest fat content?

Answer 46

evaporated milk

Question 47

what type of milk should you give to a young child?

Answer 47

whole milk (has all its vitamins)

Question 48

how much fat has been removed from semi-skimmed?

Answer 48

half

Question 49

what happens to the content of milk when the fat is removed?

Answer 49

volume of minerals are being reduced

Question 50

what is resazurin dye?

Answer 50

a chemical that changes colour depending on the amount of bacteria present

Question 51

what milk has the most bacteria present?

Answer 51

soured

Question 52

what milk has the least bacteria present?

Answer 52

fresh and boiled