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Describe and explain how the secretion of ADH affects urine production in the kidneys (4 marks)

ADH diffuses into the blood stream and binds to receptors present on the lining of the collecting duct/ DCT (1)This increases the permeability of the membrane of the collecting duct/ DCT (1)Therefore, mor...

Answered by Biology tutor
4231 Views

Describe the various mechanisms by which expression of genes are controlled by the cell's environment.

One of the mechanisms within a cell’s own environment that plays a part in controlling the expression of genes is histone acetylation and de-acetylation. These are the processes by which the lysine residu...

Answered by Yashoda J. Biology tutor
1813 Views

Osmoregulation is the process by which the body regulates the volume of water in the body. Define homeostasis and describe where osmoreceptors are located. Explain how osmoreceptors work and describe the key osmoregulation hormone and its target organ.

Osmoreceptors are located in the brain, within they posterior pituitary of the hypothalamus.Osmoreceptors shrink in response to reduced water in the blood due to movement of water from the osmoreceptor in...

Answered by Joely K. Biology tutor
2579 Views

Explain why there has been a large increase in antibiotic-resistant strains of bacteria.

An overuse of antibiotics means the non-resistant strains are killed, leaving less competition for the resistant-strains of bacteria, so they can mutate to reproduce more resistant strains of bacteria.

Answered by Anna M. Biology tutor
5521 Views

describe how kidneys filter blood?

Kidney filters blood via ultrafiltration filters small particles of blood out such as sugar salts water and urea. Large particle such are red blood cells and white blood cells stay in blood. Filtrate move...

Answered by Anastasija S. Biology tutor
1932 Views

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