cloning and biotech Flashcards

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1
Q

lactobacillus bulgaricus and streptococcus thermophilus are what type of bacteria?

A

lactic acid bacteria

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2
Q

what does acidity do to the milk proteins?

A

dentures causing them to coagulate

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3
Q

what else does fermentation add to the milk?

A

flavours

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4
Q

what are probiotics?

A

stimulate immune system and improve digestion of lactose

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5
Q

what is the bacterium used in cheese making?

A

lactobassilicus

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6
Q

what sugar does this bacterium feed on (lactobacillus)?

A

lactose

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7
Q

what is the purpose of lactobacillus in cheese making?

A

prevent growth of unwanted bacteria

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8
Q

where does rennet come from naturally?

A

stomach of young mammals

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9
Q

what enzyme does rennet contain?

A

chymosin

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10
Q

what is the milk protein called?

A

caesin

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11
Q

what is the soluble form of caesin?

A

kappa- caesin

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12
Q

what does chymosin do to kappa- caesin?

A

converts to casein which is insoluable

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13
Q

which ions bind the casein molecules together?

A

Ca 2+

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14
Q

name three methods for separating the curd from the whey

A

cutting, stirring and heating

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15
Q

what is added to produce blue cheese?

A

penecillin

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16
Q

what type of respiration does yeast mainly carry out?

A

anaerobic

17
Q

what are the products of yeast respiration?

A

CO2, ethanol

18
Q

what causes the dough to rise

A

CO2

19
Q

why does eating bread not make you drunk?

A

the alcohol evaporates in the oven

20
Q

what is the yeast in wine brewing called ?

A

s. cerevisiae

21
Q

where does s. cerevisiae grow naturally?

A

on the skin of grapes

22
Q

what are the two sugars contained in grapes?

A

fructose and glucose

23
Q

what are the products of wine fermentation?

A

co2 and ethanol

24
Q

which grains are used to make beer?

A

barley

25
Q

why are the grains allowed to germinate for a few days before being killed?

A

amylase converts starch to maltose

26
Q

what is the purpose of drying the grains after they have germinated?

A

to stop maltose being used by seedlings, it would have no sugar to turn to alcohol

27
Q

what do we called germinated dried barley grains?

A

malt

28
Q

what is the enzyme that breaks down starch?

A

amylase

29
Q

what is the sugar produced when amylase works?

A

maltose

30
Q

what happens when yeast and water are added to the malt?

A

fermentation can begin

31
Q

what is the substrate?

A

maltose

32
Q

what are the products

A

ethanol and co2

33
Q

what part of the plant do hops come from?

A

flower bud

34
Q

why are hops added?

A

for flavour and to act as a preservative

35
Q

what taste do hops have?

A

bitter

36
Q

what flavour would beer have without hops?

A

sweet

37
Q

what fungus is used to make quorn?

A

fusarium

38
Q

give two advantages of quorn

A

no animal fat/ cholesterol
very high in protein

39
Q

why may quorn be not as good as animal or plant protein?

A

different amino acid profile, no methionine