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What is the myelin sheath?

The myelin sheath is a layer of insulating, fatty material that encases some neurones. The sheath is composed of Schwann cells that have gaps called nodes of Ranvier between them. Potassium and sodium ions c...
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Answered by Alice H. • Biology tutor
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What are the methods of immobilising enzymes?

There are four methods of enzyme immobilisation: adsorption, covalent bonding, entrapment and membrane separation. Adsorption involves mixing the enyzme with an immobilsing support so the enzyme molecules wi...
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Answered by Alice H. • Biology tutor
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What is meant by the semi-conservative replication of DNA?

Semi-conservative replication means that during DNA replication, the two strands of nucleotides separate. Both strands then form the template for free nucleotides to bind to to create the two identical daugh...
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Answered by David H. • Biology tutor
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(Paper 4) English as a Global Language: What are 'Kachru's Three Circles of English'?

Braj Kachru was a Professor of Linguistics who coined the term 'World English'. 'World English' refers to the fact that the English language has been used as a global means of communication in numerous diale...
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(Paper 4) Language Acquisition: What are the different functions of 'young people's' language?

Instrumental function - language that is used to fulfil a need , such as to obtain food, drink or comfort. Regulatory function - language that asks, commands and requests . Interactional function - language ...
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