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Describe how the Meselsohn- Stahl experiment was set up. Describe how the results of the Meselsohn- Stahl experiment provide evidence for semi- conservative replication

Describe how the Meselsohn- Stahl experiment was set up. • Culture E. Coli for several generations with amino acids containing 15N. Incorporate 15N into DNA • 15N bacteria washed and transferred into medium ...
JC
Answered by Jake C. • Biology tutor
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Describe how bacteria are used to genetically modify crops. Describe two examples of GM crops. Describe the reasons why some are opposed to GM crops

Describe how bacteria are used to genetically modify crops. • Certain bacteria (Agrobacterium) can cause plant cells to multiply and form tumours by inserting plasmid DNA into genome of plant• Restriction en...
JC
Answered by Jake C. • Biology tutor
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Describe 2 ways mutations can occur

• DNA not copied properly before cell division: mistakes in copying; small errors - gene/point mutations • Chromosomes damaged/break: usually repair; but may repair incorrectly - large changes in may genes -...
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Answered by Jake C. • Biology tutor
3345 Views

Advice on Biological Natural Sciences Personal Statements

General tips It’s important that you don’t do too much. Better to a few things well than spread yourself too thin so that you’re overly grilled in interview. My recommendation is pick maybe 3 themes that you...
JC
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John invests £8000 at compound interest rate of 1.5% per year. He wants to earn more than £2000 in interest. What is the LEAST time in WHOLE years that this will take?

Step 1) Create the formula: 8000 x 1.015 n Step 2) Equate to the target value: 8000 x 1.015 n = 2000 10000 (Common mistake is to use target of £2000 but you must also take into account the £8000 that is alre...
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Answered by Hamza H. • Maths tutor
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