Top answers

Describe the pathway of an electrical signal in producing a response to a stimulus

Stimulus is detected by a recepttor e.g. the skin- Electrical signals travel from receptor to Central nervous System (CNS) via sensory neurones- CNS coordinates a response to the stimuli- CNS sends electrica...
AA
Answered by Aleena A. • Biology tutor
3508 Views

1a) Give 3 structures that an animal cell would contain and describe their function? 1b) Name 3 different structures that a plant cell contains which an animal cell would not.

1a) Nucleus: Contains the genetic material of the cellCell membrane: controls what can enter and leave the cell. Also will hold the cell togetherCytoplasm: Where cell reactions take place 1b) Cell wall, Vacu...
AA
Answered by Aleena A. • Biology tutor
3280 Views

Give an example of convergent evolution and suggest why it has occurred.

This is an example of a question a Biological Sciences candidate could expect at an Oxford interview. The interviewer might start by asking for a definition of convergent evolution ("convergent evolutio...
CH
2514 Views

How would you carry out a flame test and what colours would Li+, Na+, K+ and Ca2+ ions form?

Use a clean platinum wire loop. To clean the loop, dip in dilute HCl and hold in flame until the flame burns without any colour. Then dip clean loop into samples. Li+ turns the flame red, Na+ yellow\orange f...
RP
Answered by Rosie P. • Chemistry tutor
4488 Views

Describe and explain the events that occur in full contraction of the heart

-To start the sinoatrial node (SAN) on the wall of the right atrium sends an electrical signal across the right and left atria to contract and the blood moves into the ventricles. A layer of non-conductive t...
RP
Answered by Rosie P. • Biology tutor
3211 Views