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Explain the role of B-lymphocytes and T-lymphocytes in the defence of the body against a virus infection (6 Marks)

A virus is a pathogen which contains antigens on its cell surface. These antigens are detected and digested by macrophages. The two pathways involved in the detected and elimination of the virus is the cell-...
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Answered by Sumaiya R. • Biology tutor
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Explain the key differences between plant and animal cells.

The structure of plant and animal cells is generally similar since they are both eukaryotic cells. They contain many of the same organelles including but not limited to the nucleus, mitochondria and the endo...
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Answered by Lauren M. • Biology tutor
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(A) express 4^x in terms of y given that 2^x = y. (B) solve 8(4^x ) – 9(2^x ) + 1 = 0

(A) express 4 x in terms of y given that 2 x = y. we know that 2 2 = 4. so 4 x = 2 2^x = (2 x ) 2 = y 2 .so whenever you have 2 C^D it doesnt matter which order you solve. you can do (2 C ) D or (2 D ) C ( B...
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Answered by Sadat T. • Maths tutor
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"Ἐν Ἀθήναις διδάσκουσι καὶ νουθετοῦσι τοὺς παῖδας μετ' ἐπιμελείας." Translate this sentence into English.

"In Athens, (people) teach and advise the children with care."
TD
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Explain how increased blood flow to an athletes muscles helps them to run

"Explain" - so must give reasons why something is happening - Increased blood flow - what does this mean? Means more blood reaches the muscles -What does the blood carry (that the muscles need)? Ca...
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Answered by Emily G. • Biology tutor
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