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Explain how a substitution mutation could cause an enzyme not to work (5)

The mutation changes the order of bases so there is a different triplet code present. This results in a different amino acid being coded for in the polypeptide chain. This means a different protein with a di...
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Answered by Evie C. • Biology tutor
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"Transnational Corporations (TNCS) only bring disadvantages to their host country" To what extent do you agree? (9)

Intro- define key terms TNCs are large corporations that operate in more than one country. A host country is defined as a country that a TNC has chosen to establish part of its operations in. Para 1- agree w...
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Answered by Evie C. • Geography tutor
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Express 4x/(x^2-9) - 2/(x+3) as a single fraction in its simplest form.

To satisfy the condition of substracting two fractions with unlike denominators, a common denominator needs to be found. By recognizing x^2 - 9 = (x-3)(x+3), we can rewrite the question as 4x/(x-3)(x+3) - [2...
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Answered by Ye C. • Maths tutor
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Show that r^2(r + 1)^2 - r^2(r - 1)^2 ≡ 4r^3.

Start with the left hand side (LHS) of the equation. r^2(r + 1)^2 - r^2(r - 1)^2Take the equivalent terms from the separate parts of the LHS outside of set of brackets.r^2[(r + 1)^2 - (r - 1)^2]Expand the in...
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Answered by Andrew D. • Maths tutor
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What structure is required for a perfect 16 marker?

A perfect 16 marker would be structured like this: 1. A small introductory paragraph Perhaps including the definition of the key word put forward in the question and an introduction to your line of argument ...
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