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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

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Calculate the charge that flows past a point in a circuit with a 5.0A current for five minutes.

A coulomb the amount of charge that passes in 1 second when the current is 1 ampere.Q = It t = 5 x 60 = 300 (s) we must use Si units in physics hence the conversion to seconds here. Q = 5 x 300 Q = 1500 (...

Answered by Steffan T. • Physics tutor

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Write a recursive function that takes any integer n and prints the nth Fibonacci number.

A recursive function is a function that can call itself. Fibonacci numbers are defined:F(n) = F(n-1) + F(n-2) with F(0) = 0 and F(1) = 1, giving the sequence 0, 1, 1, 2, 3, 5, 8, 13, ... which you're prob...

Answered by Andrew G. • Python tutor

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Should doctors have a limit on their working hours?

ProsYes so that they are well rested & less likely to make mistakesYes, so that they are fresh and enthusiastic so more likely to deliver better patient careConsDoctors should have their own autonomy ...

Answered by Isra A. • Medical School Preparation tutor

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