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What are gene mutations?

A mutation is any change to the base sequence of DNA. The different types of mutations that can occur include: Subsitution - this is where one base is swapped for another Deletion - one or more bases are rem...
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Answered by Lauren G. • Biology tutor
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How do you find the coordinate of where two lines intersect?

Question: Line A has a gradient of 4 and passes through point (5,6). Line B passes through points C (0,5) and D (2,0). Find the coordinates of the point where the two lines intersection. Solution: First of a...
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Answered by Imogen W. • Maths tutor
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Why do researchers need ethical approval to conduct psychological research?

Ethics are the moral principles that guide a person’s behaviour or how they conduct an activity. Before conducting a psychological experiment, researchers must apply for ethical approval. It is important to ...
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Using Discriminants to Find the Number of Roots of a Quadratic Curve

In general, we could apply the formula to work out the solutions of a quadratic function ax 2 +bx+c=0. The b 2 -4ac part is called the discriminant and the value of a discriminant could allow us to know the ...
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Answered by Angela L. • Maths tutor
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Uranium -238 has a half life of 4.5 billion years. How long will it take a 2g sample of U-238 to contain just 0.4g of U-238?

Radioactive decay is a process where the nucleus of an unstable atom, such as Uranium-238 loses energy by emitting radiation. The half life is the average time it take for half the nuclei in a sample to unde...
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Answered by Robert E. • Physics tutor
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