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OCR A-Level Biology Biotechnology(2) Summary

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Handwritten Summary by an Oxford Medical Student which covers all content necessary for an A* in Biotechnology at OCR Biology A-Level.

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October 11, 2023
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2023/2024
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Penicillin Produced by penicillum chrysogenum
:

in nutrient rich mediums in bioreactors

Bioremediation :



down
Natural
organisms microorganisms which
naturally break
organic compounds
:




they would
Will bream down contaminants
Gm
organism not
-




normally encounter ie
Mercury
:




Aseptic :
Sterile

Inoculating broth :




suspension and
>
1
Mix bacteria sterile nutrient broth
.
2
Stopper with Cotton wool to prevent air contamination

.
3
Incubate and Shave to enable bacterial
growth
Inoculating agar :




Inoculating loop is sterilised with bunsen burner
1 .


a

2
Dip into the bacterial suspension and
.



spread across the petri dish
.
3
Seal the lid with tape but ensure can still enter
oxygen
Bacterial Growth Colonies :




lag phase
·



Adapting to their environment
:

new



log/exponential phase population grows
·




exponentially
:




stationary phase :
Stable population

·Death phase Reproduction :
ceases


limiting factors :
Nutrients , Oxygen ,
waste build-up temperature
,
, pH

Primary Produced through the functions of
metabolites normal
microorganism
:
a




Secondary Metabolites Non-essential substances often produced under stress
:




Batch fermentation :
Microorganisms are innoculated into a fixed volume of medium
·

Growth occurs-biomass and waste builds up

Chemical desired and products
·


occur to
changes reach the

Process death emptied
·


is stopped before the phase and the whole system is


Continuous fermentation inoculated into sterile nutrient medium
:
Microorganisms the

Medium is added reached
continually once log phase
·

is


Bioreactor : Waste and products are continually removed keeping the volume constant
·




·

Impellers mix and stir to ensure heat and nutrients distribute
evenly
·


Temperature and PH are monitored to maintain optimum conditions
·




Oxygen and nutrients are also added
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Handwritten A-Level notes by an Oxford University Medical Student that specifically target the content needed for an A-A*.

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