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Slide 1

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Enzymes are biological catalysts-
they speed up reactions. Enzymes are large proteins and
each has a particular shape with an
area where other molecules can fit
in (the active site). Enzymes can
either build small molecules into
larger molecules or break down
larger molecules to smaller
molecules. They also lower the
Enzymes work best in amount of energy necessary for a
warmer temperatures reaction to take place (activation
however too high a energy).
temperature and a Enzymes also work best in certain
enzyme will lose it's acidic or alkaline conditions
shape and no longer be however again if it is too acidic or
able to work (denatured). too alkaline the enzyme will be
Aerobic respiration
is the release of
energy from food
when oxygen is
available. This
usually takes place in
the mitochondria.
glucose + oxygen ->
carbon dioxide +
water [+energy]…read more

Slide 2

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Enzyme Where Breaks Into... Where it What
produced? down.... works? pH
does it
Amylase Salivary Starch Sugars Mouth and Slightly
Glands, Small alkaline
Pancreas, Intestine
Lipase Pancreas, Lipids Fatty Small Slightly
Small acids and Intestine alkaline
Intestine glycerol
Protease Stomach, Proteins Amino Stomach Slightly
Pancreas, acids and Small acidic
Small Intestine
The energy released The liver produces bile which is stored
is used for: in the gallbladder. Bile is squirted into
·Build larger the small intestine and neutralises the
molecules from stomach acid. It makes the conditions
smaller molecules slightly alkaline. Also it emulsifies fats.
·Enable muscle Biological washing powders contain
contraction in animals enzymes that digest food stains. They
·Maintain a constant work at lower temperatures so can save
body temperature in us money.
mammals and birds Protease enzymes to pre-digest
·Build sugars, proteins in some baby foods.
nitrates and other Isomerases to convert glucose to
nutrients in plants fructose. Fructose is much sweeter so
into amino acids and less is needed in food, therefore not
then proteins. as fattening.…read more


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