Search our library of A Level questions

Top answers

All subjects

A Level

What is functional RNA?

Non-coding RNA.The sequence of Messenger RNA codes for a protein so is not functional RNA. However some RNA has catalytic function, such as ribosomal RNA, doesn't code for proteins so is functional RNA. T...

Answered by Edward C. • Biology tutor

15071 Views

Simplify the following expression to a fraction in its simplest form: [(4x^2 + 6x)/(2x^2 - x -6)] - [(12)/(x^2 - x - 2)]

2(x+3)/(x+1)

Answered by Dylan H. • Maths tutor

9407 Views

What is meant by the term "degenerate" when describing DNA? Why does it occur and what are its implications for protein structure?

"Degenerate" refers to redundancy in the genetic code. Amino acids, the building blocks of proteins, are encoded by codons of three nucleotide bases. Some amino acids are encoded by more than on...

Answered by Abigail M. • Biology tutor

61370 Views

Express (3+ i)(1 + 2i) as a complex number in the form a+bi where a and b are real numbers.

One can treat complex multiplication as polynomial multiplication, but remembering i^2 = -1. To perform polynomial multiplication, multiply each term one by one, then add them together. Hence (3+i)(1+2i) ...

Answered by Alvin S. • Maths tutor

10188 Views

A ball is rolled, travelling 10 m north in 5s, then 10 m east in 10s. What is the total distance and average speed of the ball? What is the total displacement and average velocity of the ball?

First to note is how average speed, v, distance, d, and time, t, are related. This is given by v = d/t. The journey is split into two parts, but we are only asked for the total distance and average speed....

Answered by Alvin S. • Physics tutor

3299 Views