Top answers

Understanding HIV, vaccines and monoclonal antibodies

To understand how HIV causes infection, students should have an appreciation for its basic virus structure and how it infects humans. Following infection, how does it cause disease and eventually AIDS? Why a...
SS
Answered by Subi S. • Biology tutor
4642 Views

How does osmosis work?

Thinking of osmosis represented by two water towers attatched with a pipe at the bottom helped me to understand. If one tower has a higher level of water than the other, water will flow into the other to eve...
HB
Answered by Helena B. • Biology tutor
3277 Views

Explain how an impulse is transmitted between nerve cells.

An impulse reaches the pre-synaptic neurone, as it does so, the impulse stimulates voltage-gated calcium channels to open, allowing an influx of calcium ions into the pre-synaptic bouton. This stimulates ves...
JK
Answered by Jasmine K. • Biology tutor
4008 Views

What factors affect photosynthesis and why?

Temperature - the light-independent reaction is temperature sensitive due to being enzymed controlled CO2 - Is needed as a source of carbon Light intensity- Needed to 'excite' the chlorophyll (allow their el...
MO
Answered by Millie O. • Biology tutor
3140 Views

Explain why an enzyme like maltase is specific to the breakdown of maltose.

With A-level biology it is just as important to know how to answer the question and what the examiners are looking for as it is to have the knowledge to do so. There are common questions that examiners ask e...
JJ
Answered by James J. • Biology tutor
7837 Views