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If x:y = 7:4 and x+y = 88 , work out the value of x–y.

We know that x:y is 7:4, and therefore x is seven-elevenths of the total value of x and y. Therefore we can express x = 7/11 (x+y). Since we also know that the total of x+y is 88, we can substitute this into...
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Answered by Reece S. • Maths tutor
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Describe and compare the processes of abrasion, solution and attrition in a coastal landscape (5 marks)

This question is a describe question so you do not have to explain how these processes work, you should point out similarities and differences between the three processes. You should write five clear points ...
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Answered by Tessa M. • Geography tutor
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Messenger RNA (mRNA) is used during translation to form polypeptides. Describe how mRNA is produced in the nucleus of a cell.

This question, from an AQA past paper, is worth 6 marks and it is asking for you to describe the process of transcription - you do not have to explain or say why things happen. You should make 6 clear points...
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Answered by Tessa M. • Biology tutor
3142 Views

How do you form the perfect tense in Spanish?

The perfect tense in Spanish can be translated to English as 'I have done/eaten/been'. Firstly, you conjugate the verb 'haber' (to have), which is yo he, tu has, el/ella ha, nos hemos, vos habéis, ellos han....
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Answered by Lisa B. • Spanish tutor
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Name 3 possible functions for a membrane protein, and name an example for each.

Enzymatic activity. E.g. ATP synthase found in the inner mitochondrial membrane catalyses the synthesis of ATP. 2) Transport of substances. E.g. Aquaporins are integral membrane proteins that are assembled i...
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Answered by Celia N. • Biology tutor
3137 Views