Top answers

explain how the human circulatory system is adapted to remove CO2 from tissues (3)

capillaries have a high surface area to volume ratio to allow fast diffusionCO2 can diffuse from cells to blood plasmathe lungs also contain capillaries allowing CO2 to diffuse into them prior to exhalation
CE
Answered by Cameron E. • Biology tutor
3569 Views

compare and contrast transcription and translation

compareboth involve nucleotide basesboth involve RNAcontrasttranscription copies DNAtranscription produces mRNAtranslation produces a polypeptidetranslation uses tRNA molecules
CE
Answered by Cameron E. • Biology tutor
2826 Views

Describe and explain the role of positive feedback in an action potential

Describe:· Random or small amount of sodium ions enter the axon (diffusion) which leads to a slight depolarisation of the membrane· Down the concentration gradient (more sodium outside the cell than inside)·...
AH
Answered by Ayesha H. • Biology tutor
12908 Views

Helicobacter pylori can cause stomach cancer. Describe how a person infected with Helicobacter pylori could also develop liver cancer.

Cancer is caused by the uncontrolled division of cells. If a cancer is benign, it will be a certain size and stay that size. However if it is malignant, then it will grow and get bigger in size. Eventually i...
AS
Answered by Adam S. • Biology tutor
16369 Views

What's your best piece of advice for an Oxbridge interview?

Personally, going into the interview process, one of my biggest fears was not knowing the answer to a question and lapsing into silence. The best piece of advice I received before going into interviews was t...
SB
Answered by Sarah B. • Biology tutor
3050 Views