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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 force . ATP and ...
TT
Answered by Tamara T. • Biology tutor
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Derive a past participle from the infinitive in this sentence to make a correct French sentence: Les lieux ont été (déserter) par les migrants car placés sous haute surveillance policière.

I explained this question in my interview. The correct answer is désertés. We went through uses of past participles in French and how they must agree with their subjects when used as passives.
CH
Answered by Charlie H. • French tutor
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how find dy/dx of parametric equations.

We start with parametric equations of x=2t+3 and y=3t^2+3t+2. To find dy/dx, we need to work out either (dy/dt)/(dx/dt) or (dy/dt)*(dt/dx). This makes the dt's cancel each other out, allowing us to find dy/d...
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Answered by Samuel W. • Maths tutor
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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 protein is the type and number of amino acids in the...
JB
Answered by Joanna B. • Biology tutor
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Explain the variation of atomic radius along a period and along a group of the Periodic Table

The atomic radius is mostly influenced by the electron cloud and its interaction with the nucleus.Along a period, the atomic number increases, which indicates that the number of electrons also increases, giv...
MC
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