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Biology
GCSE

Describe the hormone changes which lead to ovulation.

Follicle stimulating hormone (FSH) secreted from the pituitary gland stimulates egg maturation and oestrogen secretion from the ovaries. Oestrogen in turn inhibits FSH release and stimulates luteinising h...

Answered by Tutor63102 D. Biology tutor
3805 Views

How does vaccination lead to immunity?

Vaccination involves administering a dead or inactive form of a pathogen to a subject, which stimulates white blood cells into producing antibodies specific for that pathogen. If the subject encounters th...

Answered by Tutor63102 D. Biology tutor
2519 Views

There is an increasing worry about the rise of antibiotic-resistant bacteria, such as MRSA. How can doctors ensure that this threat is minimised? (2 marks)

Doctors can ensure that there is a reduced number of antiobiotics prescribed for patients. They can also make sure that patients are fully evaluated so as to stop the prescription of antibiotics for viral...

Answered by Alex T. Biology tutor
1929 Views

What is the difference between osmosis and diffusion.

Firstly, it is important to read the question, it says what is the difference so we need to look at the differences between the two processes. Diffussion is the movement of particles from an area of high ...

Answered by Ashkun Z. Biology tutor
23204 Views

What is an enzyme?

An enzyme is a protein which acts as a biological catalyst, to speed up reactions. It has an active site which is a very specific shape to allow it to bond to a particular reagent and catalyse a specific ...

Answered by Rachel H. Biology tutor
3350 Views

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