After extraction and purification, what is the first stage in analysing a DNA sample?
What can be done to raise the amount of DNA available for analysis?
In electrophoresis, amino acids may move in different directions or not move at all, whereas DNA fragments always move in one direction. Explain these two observations.
DNA fingerprinting can also be useful in archaeology. Which of the following would not be suitable for analysis by DNA fingerprinting? Put a cross (x) in the appropriate box(es). - a strip of leather from an Egyptian tomb - skin from a mummified body - a shard of ancient pottery - wood from a Roman chariot
X-ray crystallography can be used to help analyse the structure of macromolecules. What information does this technique provide about a particular macromolecule?
Which element will be seen most strongly in the X-ray crystallography of a biological polymer of general formula $\text{C}_v\text{H}_w\text{P}_x\text{N}_y\text{O}_z$? Explain your answer.
What is meant by a partition coefficient?
A pesticide has a partition coefficient of $6.0$ between hexane and water. A solution contains $0.0042\text{ g}$ of the pesticide dissolved in $25\text{ cm}^3$ of water. The solution is shaken with $25\text{ cm}^3$ of hexane. Calculate the mass of pesticide that will be dissolved in the hexane layer at equilibrium.