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biology 0610printed 316 · PDF 316
328 pagesrevision 46933
printed 316 · PDF 316
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Aitchison College Academic Resources.
Penicillin is produced in a fermenter by growing the fungus Penicillium. The graph shows how the
mass of living Penicillium fungus and the concentration of penicillin changed over time.
mass of living i .
Penicillium ; —*
fungus : pS
concentration ,’
T qT - qT qT
0 1 3 4
time/days
When is the best time to collect the penicillin?
A at1.5 days
B at3days
C at3.5 days
D atSdays
8.
he diagram shows five stages in genetic engineering.
stage 1 stage 2 stage 3
The DNA making up The DNA of a The DNA of the
human gene is
a human gene is
isolated using
restriction enzymes.
bacterial plasmid
is cut open using
restriction enzymes.
inserted into the
bacterial plasmid DNA.
stage 4
The plasmid
containing the human
gene is put back
into a bacterium.
stage 5
The bacteria with the
human gene divide
and make the
human protein.
Which stages involve the formation of sticky ends?
A 1,2and3 B tand2only C
1and3only D 2and3only
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