Search our library of A Level questions

Top answers

All subjects

A Level

Describe the synthesis of ATP in oxidative phosphorylation

Oxidative phosphorylation is a critical component of the cell's metabolic pathway, and is responsible for the generation of most of the cell's ATP. Overall, reducing potential in the form of NADH and FADH...

Answered by Alex G. • Biology tutor

3402 Views

What is 7 to the power of 8? (

Rearrange to (7⁴)²= ((7²)²)²7²= 49(7²)² = 49² = (50-1)² = 50² - 2x50 + 1 = 24017<...

Answered by Michael H. • Maths tutor

5247 Views

The numbers a, b, c and d satisfy the following equations: a + b + 3c + 4d = k; 5a = 3b = 2c = d. What is the smallest value for k for which a, b, c and d are all positive integers

5a = 3b = 2c = d. d must be a multiple of 5, 3 and 2, therefore the smallest possible value for d is 30. This sets a = 6, b = 10 and c = 152) a + b + 3c + 4d = 6 + 10 + 3x15 + 4x30 = 181 k = 181
MH
Answered by Michael H. • Maths tutor
4597 Views

Explain why excited atoms only emit certain frequencies of radiation after an electron collides with the atom

Radiation is emitted via photons2) Photon energy is governed by the equation E = hc/wavelength, where h = the Planck constant and c = the speed of light. Both h and c are constants3) Electrons have ...

Answered by Michael H. • Physics tutor

6105 Views

How would I answer a question on love/music in this unseen passage from The Mill on the Floss?

Great question. I've had a look over the passage and decided to focus on the extract below to give you an idea of how I'd go about approaching a close analysis. I think the key here is to 1) underline any...

Answered by Emily S. • English Literature tutor

3305 Views