Top answers

Outline the process of DNA replication

During DNA replication the double-stranded DNA helix is separated to single strands by the enzyme DNA helicase. This exposes the nucleic acid bases that encode the genetic sequence. Replication is then initi...
LW
Answered by Lorna W. • Biology tutor
3758 Views

How do we pick up maximum marks in each question?

The first thing you should be doing when you read a question is to make sure that you understand exactly what it is asking from you for which subject knowledge is extremely important. Underlining or highligh...
AH
Answered by Amaarah H. • Biology tutor
6585 Views

Briefly describe the main differences between fast and slow twitch muscles and how does this relate to their specific functions.

First of all, slow-twitch (type I) muscle fibres have a large number of mitochondria allowing them to carry out aerobic respiration at a high rate by providing a site for the Kreb's cycle (taking place in th...
SG
Answered by Sebastian G. • Biology tutor
5054 Views

Describe the process by which an action potential is propagated across a cholinergic synapse

A cholinergic synapse is one which uses acetycholine (ACh) as it's neurotransmitter. When the action potential reaches the synaptic knob at the presynaptic cell it leads to voltage gated Ca 2+ channels in th...
DM
Answered by David M. • Biology tutor
3551 Views

The epithelial cells in the lungs are arranged into alveoli. Explain how the alveoli create a surface for efficient gaseous exchange.

Alveoli are made of two main types of cells. The alveoli walls are made of a single layer of squamous alveolar cells (aka Type I cells ), which are flat and thin, further shortening the diffusion distance. A...
YM
Answered by Yasamin M. • Biology tutor
5319 Views