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Biology
A Level

How does ATP contribute to energy requiring reactions?

ATP -> ADP + Pi (via ATP hydrolase)ATP hydrolysis as shown above can be coupled to energy requiring reactions in a cell. The Pi released can be used to phosphorylate another molecule in the reaction th...

Answered by Rob H. Biology tutor
1718 Views

Explain the role of the loop of Henle in producing concentrated urine.

Na+ ions are actively transported from ascending limb this lowers the water potential in the medulla water diffuses out go the descending limb, but not the ascending limb as it is impermeable water also l...

Answered by Maisha H. Biology tutor
1845 Views

Describe the functions of glycoproteins in the cell surface

Glycoproteins can be antigens, enabling cell recognition of self and non-self cells. They also act as receptors for molecules such as hormones and drugs ...

Answered by Ruth N. Biology tutor
17825 Views

The herbicide atrazine works by disabling plastoquinone, one of the proton pumps in photosystem II. Explain how atrazine would kill a susceptible plant (5 marks) (OCR A specimen paper 3)

Atrazine prevents photophosphorylation from occurring because when plastoquinone is disabled H+ ions cannot be pumped into the thylakoid space therefore their will be a reduced proton motive for...

Answered by Tamara T. Biology tutor
5550 Views

What is the structure of a protein?

Proteins are a class of molecules made up of small sub-units called amino acids. Every type of protein has a unique structure. The primary structure of a...

Answered by Joanna B. Biology tutor
1477 Views

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