Search our library of Biology questions

Top answers

Biology

All levels

What are the key principles of evolution?

Variation: there is variation in the physical and behavioural characteristics of a set of organisms. This variation is caused by a combination of genetic and environmental factors.

Answered by Ivan S. • Biology tutor

5720 Views

What is the difference between a eukaryote and a prokaryote?

Generally a prokaryote is smaller, reaching roughly up to 5μm while eukaryotes are larger reaching roughly up to 100μm.

Eukaryotes have 80s ribosomes but prokaryotes have 70s ribosomes. <...

Answered by Nadia H. • Biology tutor

3917 Views

Which muscles in the gut wall are involved in peristalsis?

Circular muscles - reduce the diameter of the gut when they contract

Longitudinal muscles - which reduce the length of the gut when they contract

The muscles work together ...

Answered by Yashaswini C. • Biology tutor

4408 Views

Where is water absorbed in the digestive system? - Duodenum, Ileum or colon?

The answer is the colon (large intestine)

The Duodenum is where food is mixed with digestive enzymes and bile. In the ileum, digested food is absorbed into the blood and lymph. Therefore...

Answered by Yashaswini C. • Biology tutor

38572 Views

What is a gene?

A gene is a section of DNA (can explain DNA if necessary). Genes are responsible for making the different proteins that carry out different functions in our body.They can be inherited, passed on to fut...

Answered by Ellie D. • Biology tutor

5456 Views