Top answers

Biology
GCSE

Explain how carbon is cycled in the environment, including the role of all living organisms and the use of fossil fuels.

This question was taken from a recent past paper.Let's start by working out what the examiner is looking for here. This question makes it quite obvious, as it states the words 'carbon' and 'cycle', tellin...

AP
Answered by Adele P. Biology tutor
5251 Views

How can you tell a cell is an animal and not a plant cell?

Animal cells and plant cells contain structures, called organelles. (ask student what an organelle is; a specialised micro-structure within a cell that has a specific function) Some of these organelles ar...

HA
Answered by Hidaya A. Biology tutor
6027 Views

How can molecules cross a cell membrane?

Semi-permeable membranes in the cell will let some molecules through but not others. There are three main ways in which these molecules can move. 1) Active transportAs the name suggests, here, molecules a...

JR
2435 Views

What are the fundamental differences between a cell membrane and a cell wall?

Both encase different type of cells however their compositions are distinct and because of this they have different functions and distributions across cell types. 
Structure and composition

JM
4072 Views

How and where oxygen is produced in photosynthesis?

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