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What are the names given to the body's first and second line of defence against disease? Name an example for each and how it works to prevent disease.

The first line of defence is passive immunity. An example is the skin and its job is to prevent a pathogen entering the body in the first place. Pathogens cannot penetrate the skin. The second line of defenc...
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Answered by Eric P. • Biology tutor
7244 Views

Describe transcription and translation.

Transcription is the making mRNA from DNA. Translation is using the mRNA to code for a protein.
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Answered by Clemmie B. • Biology tutor
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Compare the medical uses of ultrasound and X-rays. Your answer should include the risks, if any, and precautions, if any, associated with the use of ultrasound and X-rays. [6 marks]

For six mark questions, it is important to remember that your quality of written communication will be assessed. This basically means that you're spelling, punctuation, use of terminology and how you form se...
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Answered by Nicholas M. • Physics tutor
17033 Views

What is the difference between the short run and long run?

The short run and long run is not determined by a set period of time, but rather by which factors of production are fixed. In the short run, at least one factor of output is fixed. Whereas in the long run, n...
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Answered by Zoe C. • Economics tutor
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A is the point with coordinates (1, 3) B is the point with coordinates (–2, –1) The line L has equation 3y = 4 – 2x Is line L parallel to AB?

No it is not parallel, here is the reasoning. First we work out the gradient of the line AB. We do this by using the gradient formula (Y2-Y1)/(X2-X1). Our points are A=(1,3) rewritten as (X1,Y1) and B=(-2,-1...
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Answered by Emily L. • Maths tutor
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