Search over 10,000 free study notes

There are 2 components, the sympathetic nervous system and the parasympathetic nervous system. They are a collection of nerves and neurotransmitters throughout the human body and present in both the centr...

At GCSE osmosis was simplified to just diffusion of water so it is the spreading out of water molecules from where there is a high concentration to a low concentration- but in fact osmosis depends both on...

To replicate the DNA of a eukaryotic cell, the double helix structure must first be unwound to present the base pair sequence. This is done using DNA helicase (this enzyme breaks the hydrogen bonds connec...

1. mRNA is only single stranded, whereas DNA is a double stranded molecule 2. mRNA has Uracil instead of thymine which is found in DNA 3. mRNA contains no introns as they have been spliced out, however...

Ask the student: what other option is there? What are the differences between the two? 

Answer: Humans have a small surface area to volume ratio, so diffusion alone is not enough to meet the high m...