A Worksheet on Enzymes and Digestion

A fill in the blanks, it takes time, but complements the AQA Biology (new spec) book, and has all notes you need for that section once completed..**

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  • Created on: 05-08-09 15:38
Preview of A Worksheet on Enzymes and Digestion

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Enzymes and Digestion...
The human digestive system is made of long muscular __________ with associated
__________. The glands produce _______________ that break down large
_______________ into smaller ones ready for _______________.
The main parts of the Digestive System...
The Salivary Glands pass their secretions onto the food. These secretions contain the
salivary _______________ _______________ which breaks down starch
molecules into maltose.
The Oesophagus carries food from the _______________ to the
_______________. It is therefore _______________ for _______________ rather
than digestion or absorption. It is made up of a __________ muscular wall.
The Stomach is a muscular sac with an inner layer that produces _______________.
Its role is to __________, and __________ food, especially _______________. It
has glands which produce enzymes which digest proteins. Other glands produce
_______________, which _______________ the stomach being digested by its own
The Pancreas is a large gland that secretes pancreatic juice. This secretion contains
_______________ to digest _______________, _______________ to digest
_______________ and _______________ to digest _______________.
The Small Intestine is a long muscular __________. Its walls produce
_______________ which further digest the molecules. It also has __________ which
secrete onto the molecules further breaking them down. The inner walls of the small
intestine are folded into __________, which gives them a large surface area. Each villi
has an epithelial cell which also has _______________ which further increases the
surface area. This shows how the small intestine is adapted for _______________.
The Large Intestine absorbs water.
The Rectum stores the _______________ that are removed via the anus.

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Page 2

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Diagram showing the main parts in the Digestive System...…read more

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Digestion has two main parts...
o ...physical breakdown...
o ...and chemical digestion.
Physical Breakdown
This is when the food is broken down by _______________ (such as the teeth.) This makes it
easier for the system to digest the food, and also provides a __________ surface area for the
digestion. Food can also be churned up by the _______________ in the _______________
wall which also breaks it up.
Chemical Digestion
This breaks down large and _______________ molecules into smaller _______________
molecules.…read more

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An individual unit (or molecule) is called a _______________. Carbon atoms can join to
form longer chains of these repeating units (or molecules). These are called
_______________. _______________, and _______________ are often polymers.
In Carbohydrates, the basic monomer unit is a __________, which can also be called a
_____________. Therefore, a single monomer is called a _______________. Two
monosaccharides can combine to form a _______________. More than two monosaccharides
can combine to form a _______________.
A very wellknown monosaccharides is _______________.…read more

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When combined in pairs, monosaccharides can form disaccharides.
For example...
o Glucose linked to glucose forms _______________
o Glucose linked to fructose forms _______________
o Glucose linked to galactose forms _______________
When monosaccharides join, it is a condensation reaction, therefore a molecule of __________
is lost. The bond fromes is called a _______________. The reverse of this reaction is a
_______________ reaction which breaks the glycosidic bond and releases the
monosaccharides.…read more

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Polysaccharides are _______________ formed by combining many _______________
molecules. These molecules are joined by a _______________ bond that were formed by a
_______________ reaction.
Polysaccharides are large, and _______________ molecules. They are suitable for use as
storage molecules. __________ is a polysaccharide that is found in many __________.
The Test for Starch
1. __________________________________________________________________
2. __________________________________________________________________
3. __________________________________________________________________
Diagram of Monosaccaride...
Diagram of a Disaccharide...
Diagram of a Polysaccharide...…read more

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Starch Digestion
Enzymes are _______________, therefore it usually takes more than one enzymes to
completely break down a large _______________. Typically one enzyme breaks down the
molecule into smaller _______________, and then __________ enzymes break these down
further into their monomers. These enzymes are usually produces in _______________ parts of
the _______________ system. This is because each enzyme works __________ at different
_____ levels.
Summary of Starch Digestion...…read more

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Disaccharide Digestion...
_______________ must be physically broken down by the teeth in order to release it. It
passes through the _______________ and into the _______________, whose epithelial lining
produces the enzyme _______________.
Sucrase _______________ the single _______________ bond in the sucrose molecule to
produce the two _______________ that make up sucrose. (These are glucose, and fructose.)
_______________ can be found in __________ products. It is digested in the
_______________ whose epithelial lining produces the enzyme _______________.…read more



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