Search our library of homework questions

Top answers

All subjects

All levels

Explain how a deletion mutation in a strand of DNA can affect the primary, secondary and tertiary structures of the protein for which it codes.

A deletion in a strand of DNA would result in a frameshift mutation, where the other base pairs following the deletion would move 'to the left' which would change the base pairs throughout the rest of the...

Answered by William S. • Biology tutor

11249 Views

Solve the simultaneous equations 2x + 7y = 15 and 3x + 6y = 21

Find the lowest common multiple of 2 and 3, which is 6. Multiply each term in the first equation by 3, and each term in the second equation by 2 to produce two equations with the same coefficient of x (wh...

Answered by Isobel R. • Maths tutor

3366 Views

Explain what is meant by counter current exchange in fish? Describe how it works and what adaptations the gills have to assist it.

Counter current exchange is the mechanism in which oxygen enters the blood in fish. Blood flows in the opposite direction to the water that flows over the fish's gills. Fish gills have gill filaments and ...

Answered by Katie F. • Biology tutor

66528 Views

Fully factorise 2a^2b+6ab^2

^{1) Find the common factor between 2 and 6 (if there is one)...}^{...which is 2.}^{2) Find the common factor between a^2b and ab^2...}^{...which is ab.}^{3) Combine...}

Answered by James H. • Maths tutor

18481 Views

How do you calculate the total resistance of two resistors, R1 and R2, when they are in series and when they are in parallel?

When resistors are in series you may add up their resistances to find the total resistance, R_Total= R1 + R2. However, when resistors are in parallel, it gets a little more complicated. You must...

Answered by Jamie M. • Physics tutor

13151 Views