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Describe the structure of DNA

Nucleotides make up DNA. Nucleotides themselves are made up of a phosphate, sugar and base. They bases are: Adenine (A), Thymine (T), Cytosine (C), Guanosine (G). A is bonded to T. C is bonded to G. The base...
ML
Answered by Miranda L. • Biology tutor
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Using the substitution u = ln(x), find the general solution of the differential equation y = x^2*(d^2(y)/dx^2) + x(dy/dx) + y = 0

dy/dx = (dy/du) (1/x), d^2(y)/dx^2 = (d^2(y)/du^2) (1/(x^2)) - (dy/du)*(1/(x^2)) (x^2) ( (d^2(y)/du^2) (1/(x^2)) - (dy/du) (1/(x^2)) ) + x (dy/du)*(1/x) + y = 0 d^2(y)/du^2 - dy/du + dy/du + y = 0 d^2(y)/du^...
IK
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Solve (x+2)/3x + (x-2)/2x = 3

In order to solve this equation we need to rearrange it to have all of the variables on one side of the equals sign and the constants on the other. We do this by multiplying each term by the denominator of o...
AY
Answered by Annabel Y. • Maths tutor
19964 Views

How do I solve simultaneous equations?

A easy way to solve simultaneous equations is to substitiute one equation into another and then equate to find one of the unknowns. Once this has been found its a simple matter of substituting it back into t...
KL
Answered by Kishen L. • Maths tutor
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Why do branch chained isomers have lower boiling point than straight chain equivalents?

As branching increases the boiling point decreases because there are fewer points of contact. This also means van der Waals forces are weaker in branch chained isomers and thus less energy is required to ove...
KL
Answered by Kishen L. • Chemistry tutor
35424 Views