Top answers

How does an action potential cause contraction in skeletal muscle?

The point at which a motor neurone synapses with a muscle fibre is called the neuromuscular junction. The unmyelinated nerve fibre stops around 30 nanometers before the muscle fibre, leaving a gap called the...
OM
Answered by Orla M. • Biology tutor
11717 Views

Explain the structure of a Protein and how this can relate to its function.

A protein is a polymer made up of 20 possible amino acid monomers . The amino acid monomers are made up of three components: 1) An acid group 2) A variable group 3) An amine group. The amine group of one ami...
ED
Answered by Emma D. • Biology tutor
65303 Views

What is the Endosymbiosis Theory?

Lynn Margulis proposed this theory in 1996. It explains how the eukaryotic cells engulfed through endophagocytosis some organelles such as mitochondria and chloroplasts, which evolved from bacteria. The cell...
IG
Answered by Ingrid G. • Biology tutor
6143 Views

Discuss the relative importance of genetic and cultural evolution in the recent evolution of humans.

· Changes in genotype (genetic evolution via natural selection) have lead to cultural evolution in humans by promoting intelligent behaviour · Larger brain sizes have promoted increased learning capacity / g...
ZK
5079 Views

Discuss the incompleteness of the fossil record and the resulting uncertainties about human evolution.

Incompleteness of the Fossil Record ▪ Fossilisation is an exceptionally rare occurrence that requires an unusual combination of special conditions ▪ Most living things tend to decompose rapidly (or be scaven...
ZK
10252 Views