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Phospholipids are arranged in a bilayer (a double layer). They have hydrophobic tailss (made of fatty acids) and hydrophilic heads (made of a phosphate group). 

The hydrophilic heads are ...

A reflex is an innate (in built) action designed to keep an organism safe from harm.  A good example of a reflex is to imagine you touch a hot pan, you immendiately withdraw your hand from the painful ...

Answering questions in biology that offer more marks is all about key words - usually the examiner has a few of these in front of them that offer a mark simply for using the word in your answer. The go...

In the double circulation system there are two routes that the blood can take:

1. Through the lungs

2. To the rest of the body

The blood starting in the heart ...

First of all we have to understand that there are concentration gradients between cells and the outside. A higher concentration of solute is when there is more solute (eg salt) ...