Top answers

What is Osmosis

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration. This is done through a semi-permeable membrane. The aim is to have the same concentration of wat...
MG
Answered by Miranda G. • Biology tutor
2884 Views

Explain why the tidal volume and breathing rate increase over the course of a spirometer experiment?

Since the spirometer is a closed system, over time the oxygen concentration will decrease and therefore the oxygen concentration in the blood per inhalation will decrease. When the blood reaches the medulla ...
DL
Answered by Dominic L. • Biology tutor
2955 Views

Outline the stages of phagocytosis

Phagocytes recognise and bind pathogens through chemical attraction and receptors. Phagocytes (white blood cells) engulf the pathogen so it is contained within the cell in a phagosome. Lysosome containing ly...
Answered by • Biology tutor
3525 Views

A student investigates phototropism in wheat seedlings. She cuts the tips off some of her seedlings. She leaves the seedlings in the window. Two days later the seedlings have bent towards the light. Describe and explain these findings.

removing tips removes auxin so growth stopsauxin collects on the shaded sideauxin causes cell elongation on the shaded sideelongation on one side causes shoot to bend to the other sidethis is positive photot...
AA
Answered by Amina A. • Biology tutor
3435 Views

Describe how alterations to tumour suppressor genes can lead to the development of tumours.

Alterations to tumour suppressor genes such as their increased methylation, mutation in the genes, or an instance where the tumour suppressor genes are not being transcribed or expressed, results in rapid an...
LE
Answered by Lucy Erin S. • Biology tutor
12019 Views