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Explain how bacteria can become resistant to antibiotics.

Sometimes, a chance mutation in bacterial DNA allows certain bacteria to become resistant to certain types of antibiotic. When an antibiotic is given, only the non-resistant strains of bacteria will be ki...

Answered by Rachel A. • Biology tutor

4447 Views

On a Production Possibility Frontier diagram, indicate a point where resources are efficiently allocated (label X) and an inefficient one (labelled Y). Explain why X is efficient, why Y is inefficient and how output could be increased from both.

Concave PPF diagram - point X anywhere on the curve, point Y strictly inside the curve. X is efficient because an increase in output of one good cannot be achieved without reducing the output of the other...

Answered by Karl T. • Economics tutor

2007 Views

What is ratio analysis and why is it being used?

Ratio analysis is a numerical technique of re-expressing financial statements. It aids decision making by summarising and interpreting financial statements more easily. There are different sets of ratios,...

Answered by Nazik S. • Accounting tutor

3739 Views

(x - 3)(x + 4) = 0 Solve for x

(x - 3)(x + 4) = 0 x=3 and x=-4

Answered by Danayan L. • Maths tutor

3978 Views

If fetal haemoglobin is so good at binding oxygen, why aren't we adapted to keep it until adulthood?

Firstly, although fetal haemoglobin is better at binding oxygen, it is also worse at giving up oxygen to the tissues which need it. Secondly, if adults had haemoglobin with the same affinity for oxygen as...

Answered by Amber B. • Biology tutor

4811 Views