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B3a Molecules of Life

1. ................ carries genetic information.
................ ................ controls the movement of substances in and out of cells.
................ is where many chemical reactions happen.
................ occurs in the mitochondria providing energy for life processes.

2. Label these parts on the animal cell
diagram:

Cell membrane /…

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(a) Plot a graph using her first three results.
Finish the graph by drawing the best
curve. (2)








(b) What results would you expect at pH 4 and pH 5?
Extend the line to show your answer. [1]

(c) What is produced when pepsin digests protein?
7. (a) Many chemical…

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(ii) Look at the graph. What is the optimum pH of amylase?
......................................................................................................................................
(b) Amylase takes much longer to break down starch at pH 12.
Suggest why.


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(c ) The optimum temperature for another enzyme is 40°C. The activity of this
enzyme decreases above this temperature. This is because…

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Complete the diagram to show the bases in the new DNA strands
(ii) describe the stage is involved in the production of human insulin, by genetically
modified bacteria
Human ................ that produces insulin is removed
This gene is inserted into the chromosome of a ................
These chromosomes are called ................…

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