Download Homework Exercise 6 1(a). Name the “building blocks” of a protein

Cell Biology Homework – Key Area: Proteins and Enzymes
Homework Exercise 6
1(a). Name the “building blocks” of a protein
(1)
(b). What determines the shape of a protein?
(1)
2. Copy the table below and draw straight lines to match the protein to its function .
Protein Group
Function of a Protein
A. Structural
1. These proteins are vital in the
control of growth and development
B. Enzyme
2. Membrane protein which allow cells
to recognise specific substances
C. Hormone
3. Are proteins that control all of the
reactions taking place in a cell.
D. Antibodies
4. These proteins form muscles, nail,
hair and skin.
E. Receptor
5. Protect us from disease
(5)
3. With reference to enzymes, define the term biological catalyst.
(1)
Enzymes are biological catalysts. The diagram below shows part of an enzyme
controlled reaction.
(a) Describe the features of an enzyme which allow it to combine with
only one substrate.
(1)
(b) What amount of living cells produce enzymes?
(i) all
(ii) most
(iii) some
(iv) a few
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(1)
Cell Biology Homework – Key Area: Proteins and Enzymes
4. Which line in the table below correctly shows information about an enzyme?
Rate of the
chemical reaction
Enzyme at the end of
the reaction
A
Speeds up
unchanged
B
Slows down
unchanged
C
Speeds up
changed
D
Slows down
changed
(1)
5. The diagram below shows three stages X, Y and Z that occur when an
enzyme converts a substrate into a product.
enzyme
(i) This enzyme promotes the breakdown of a complex molecule into simpler
molecules.
Put the stages into the correct order to show this degradation reaction.
________
________
________
(1)
(ii) Which number in the diagram shows the active site?
22
(1)
Cell Biology Homework – Key Area: Proteins and Enzymes
6. The diagram below shows an investigation into the digestion of starch
by amylase, using a model gut.
Which line in the table below describes correctly the content of a model gut
which should be used as a control?
Starch
solution (cm3)
Amylase
solution (cm3)
Water
(cm3)
A
10
0
1
B
0
10
1
C
10
1
0
D
1
0
10
(1)
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