Top answers

what are enzymes?

Enzymes are biological catalysts . They speed up chemical reactions in all living things, and allow them to occur more easily. They occur in plant cells and animal cells. Enzymes are chemical molecules, made...
AB
Answered by Alex B. • Biology tutor
4630 Views

What's the difference between cell division and cell differentiation?

Cell differentiation allows a cell to specialize to achieve a specific function Multicellular organisms (eg: humans) have different types of cells which have different functions. For example: a muscle cell n...
SL
Answered by Svet L. • Biology tutor
49239 Views

How can I memorise my presentation for the oral exam?

There are many different techniques so you have to find what works for you. The most important things are time and patience. One technique which I would really recommend is recording yourself reading out the...
LS
Answered by Laura S. • Spanish tutor
7945 Views

A 15kg cannonball and a 1kg football are dropped to the ground from a height of 10 metres. Calculate the speed of the cannonball and of the football just before they hit the ground (you may ignore air resistance).

Aim of question: demonstrate that the speed of a dropped object is independent of its mass, and depends only on the height it is dropped from. Solution: equate formulae for kinetic energy and for gravitation...
WR
Answered by Will R. • Physics tutor
2838 Views

How do you site a text?

You can either quote a direct piece of the text in "" and say what passage of what book it is from. Or you can paraphrase what is being said in a passage of a text and specify what part of the text...
AL
Answered by Alice L. • English tutor
2312 Views