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11 22 33 44 55 66 77 88 99

1010 1111 1212 1313 1414 1515 1616 1717 1818

1919 2020 2121 2222 2323 2424 2525 2626 2727

29292828 3030 3131 3232

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What is PHOTOSYNTHESIS? answer

The process by which plants make carbohydrates from carbon dioxide

and water using light energy

1

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What factors can change the efficiency of enzymes?

Change in pH or temperature

answer

2

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What gas is released as a by-product of photosynthesis?

Oxygen

(O2)

answer

4

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What is respiration?

The process by which livings things obtain their energy by breaking down carbohydrates

answer

5

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Name the substance plants require to absorb light during photosynthesis

Chlorophyll

answer

6

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The alcohol produced during fermentation is ……….?

Ethanol

answer

7

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The water and alcohol mixture formed in the fermentation reaction be separated by ……?

DistillationThe process can also be used to increase the concentration

of fermentation products

answer

8

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The reactants in respiration process are ………?

Carbohydrate and oxygen

answer

9

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How are alcoholic drinks made?

Alcoholic drinks are made by fermenting any fruit or vegetable which is a source of sugars. An enzyme produced by yeast acts as a catalyst for the reaction

answer

10

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The elements in carbohydrates are……..?

carbon

hydrogen

oxygen

answer

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Fermentation is……..?

The breakdown of carbohydrates to form

alcohol

answer

12

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Give examples of alcoholic drinks and the source of carbohydrate from which they are made.

Wine = grapesCider = applesWhisky = barleyVodka = potatoes

answer

15

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Monosaccharides are ……..?

Carbohydrates with the molecular formula C6H12O6

answer

16

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Name two monosaccharides?

Glucose and fructose

answer

17

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Name a disaccharide?

SucroseMaltose

answer

18

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Name a polysaccharide?

Starch

answer

19

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Describe the effect of changes in pH and temperature on the efficiency of an enzyme?

An enzyme works best at a certain pH and temperature (their

OPTIMUM pH and temperature). Above and below the optimum

their efficiency is reduced.

answer

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HYDROLYSIS is ………….?

The breaking up of large molecules by addition of the

elements of water

answer

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ENZYMES are ……?

Biological catalysts

answer

22

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The molecular formula for disaccharides is…………..?

C12H22O11

answer

23

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The molecular formula for monoaccharides is…………..?

C6H12O6

answer

24

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Why can Glucose and fructose be described as ISOMERS?

Both have the same molecular formula

(C6H12O6 ) but different structural

formulae

answer

25

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What happens when carbohydrates are burned?

They release energyandproduce carbon dioxide and water.

answer

26

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The test for starch is …… ?

Starch gives a blue-black colour with Iodine

answer

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What is the test for reducing sugars?

Reducing sugars gives a brick-red colour with BENEDICT’S solution

answer

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What is the test for glucose?

answer

Glucose gives a brick-red colour with BENEDICT’S solution

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What is the role of amylase in the human body?

Amylase is the enzyme involved in the breakdown of starch into smaller

molecules during the digestion process

answer

30

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Why must starch be broken down to smaller molecules during the process of digestion?

Starch molecules are very large and must be broken down until they are

small enough to pass through the gut wall into the bloodstream to be used in

digestion

answer

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How does the structure of starch relate to glucose?

Starch is a polymer molecule made from many glucose monomer units joined

together

answer

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Why is starch a condensation polymer?

When many glucose molecules link together to form the polymer starch they

join with the loss of water molecules

answer

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Why can alcohol above a concentration of about 15% not be made by fermentation?

Above 15% the alcohol poisons the living organisms in the yeast and stops

the reaction

answer

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Which sugar does NOT turn Benedict’s brick-red?

Sucrose

answer

32.