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There are many specialised cells in the body which have developed from embryonic stem cells. What is the name used to describe this process? Go on to describe how this process may occur.

Process - Differentiation. Explanation - The only genes which are expressed in the cell are those which are characteristic to that cell type.
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Answered by Rory B. • Biology tutor
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With aid of diagrams, explain the formation of a U shaped valley

U shaped valleys are formed from V shaped valleys. Ice and snow accumulates in the V shaped valley and enters the cracks where it freezes and expands overnight. As the snow melts during the day this relieves...
Answered by • Geography tutor
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How can I answer an RUAE question on author bias?

Bias is when an author is trying to influence the reader's opinion on a topic.Bias within a text can usually be recognised through the connotations of the author's word choice. If the majority of the words i...
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Answered by Sophie P. • English tutor
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1. Parabens are esters of 4-hydroxybenzoic acid (*structure*), give example of a paraben & draw other compound used to make it. 2. Suggest a possible use for parabens. 3. What type of hybridisation does the aromatic carbon adopt? 4. How do pi bonds form?

Eg. methyl/ethyl/propyl (etc.) paraben. Drawing of the alcohol used to make paraben. Possible uses: food preservative, cosmetic, or pharmaceutical use. The aromatic carbon atoms are sp 2 hybridised. p orbita...
Answered by • Chemistry tutor
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Explain why it is important for a mammal to regulate its body temperature

The optimum temperature for enzymes in the body is around 37oC. If the body temperature falls below this temperature then enzymes will work too slowly for body process to occur fast enough the keep the mamma...
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Answered by Catriona H. • Biology tutor
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