Top answers

What is a ligand?

A species with one or more valence electron pairs that forms co-ordinate bonds with a metal ion.
UY
Answered by Umamah Y. • Chemistry tutor
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What are the two main secondary structures of proteins?

Alpha helices and Beta pleated sheets.
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Answered by Umamah Y. • Biology tutor
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Megapode birds open and close the air vents of the nest at different times of the day. Suggest reasons why it is necessary to open and close the air vents.

There are a number of reasons why it is necessary to open and close the air vents. These include; allowing oxygen in, which is also necessary for respiration and allowing heat to escape. Closing the air vent...
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Answered by Davina R. • Biology tutor
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y is proportional to x^2. When y is 75, x is 5. Find a formula for y in terms of x

y is proportional to x 2 so this means y = A*x 2 for some constant A. When y = 75, x = 5. Put these values in the formula above to find A: 75 = A*25 75/25 = A A = 3 So y = 3x 2
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Answered by Thomas M. • Maths tutor
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Differentiate 4x^2 + 2ln3x + e^x

To differentiate x 2 you bring the power of x down, then reduce the power of x by 1, so d/dx(x 2 ) = 2x 1 ln3x differentiates to (d/dx(3x))/3x = 3/3x = 1/x e^x differentiates to (d/dx(x)) e^x = 1 e^x Therefo...
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Answered by Thomas M. • Maths tutor
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