Post on 01-Apr-2015
mmcl2003
mmcl2003
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What is PHOTOSYNTHESIS? answer
The process by which plants make carbohydrates from carbon dioxide
and water using light energy
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What factors can change the efficiency of enzymes?
Change in pH or temperature
answer
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What gas is released as a by-product of photosynthesis?
Oxygen
(O2)
answer
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What is respiration?
The process by which livings things obtain their energy by breaking down carbohydrates
answer
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Name the substance plants require to absorb light during photosynthesis
Chlorophyll
answer
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The alcohol produced during fermentation is ……….?
Ethanol
answer
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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
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The reactants in respiration process are ………?
Carbohydrate and oxygen
answer
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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
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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
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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
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Monosaccharides are ……..?
Carbohydrates with the molecular formula C6H12O6
answer
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Name two monosaccharides?
Glucose and fructose
answer
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Name a disaccharide?
SucroseMaltose
answer
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Name a polysaccharide?
Starch
answer
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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
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The molecular formula for disaccharides is…………..?
C12H22O11
answer
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The molecular formula for monoaccharides is…………..?
C6H12O6
answer
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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
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What happens when carbohydrates are burned?
They release energyandproduce carbon dioxide and water.
answer
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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
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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
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Which sugar does NOT turn Benedict’s brick-red?
Sucrose
answer
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