Top answers

describe the structure of prokaryotic cell (4 marks)

they don't have a nucleus, the DNA is present in cytoplasm. prokaryotic cell has a cell membrane that controls movement of molecules in and out of the cell. prokaryotic cells also have cell walls that provid...
JL
Answered by Julia L. • Biology tutor
3003 Views

Let z=x+yi such that 16=5z - 3z*, What is z?

z* is the complex conjugate of z therefore z* = x - yi. So 16 + 32i = 5(x + yi)-3(x - yi), real: 16 = 5x - 3x => 16=2x => x=8, imaginary: 32 = 5y + 3y => 32 = 8y => y=4, therefore z = 8 + 4i.
BC
Answered by Ben C. • Maths tutor
3895 Views

Could you explain why water has a high latent heat of vapourisation?

A water molecule is polar. Due to the uneven sharing of electrons in the hydrogen-oxygen covalent bond, the oxygen molecule is slightly negatively charged and the hydrogen atoms are slightly positively charg...
SJ
Answered by Steffan J. • Chemistry tutor
7775 Views

To what extent was Stalin’s treatment of opposition a divergence from Lenin’s approach? Answer with reference to the years 1917-41.

This is a standard A level Russian/Soviet history essay title.points may include:Similarities - establishment of a one-party state, use of political terror and silencing of opponents, class warfare, secret p...
RF
Answered by Rachel F. • History tutor
2728 Views

Could you describe the blood flow through the heart?

Blood flows through human bodies via a double circulatory system, the systematic system and the respiratory system, which are connected by the heart. Blood enters the right atrium of the heart from the vena ...
SJ
Answered by Steffan J. • Biology tutor
3170 Views