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Outline photoactivation of photosystem II in the light-dependent reaction of photosynthesis.

light absorbed by pigment molecules (chlorophyll)causes electron to be raised to higher energy level; electron is passed along chain of carrier molecules in photosystem II
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Answered by Urte P. • Biology tutor
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How are epigenetics involved in regulating gene expression?

Epigenetic control of gene expression involves mechanisms that do not alter the sequence of DNA itself. External factors acting upon cells translate their signals via cascades to the nucleus, where they act ...
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Answered by Harry H. • Biology tutor
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How can I use the normal distribution table to find probabilities other than P(z<Z)?

The normal distribution tables show, for a given Z value, the probability that the random variable z takes a value less than Z or P(z&lt;Z). This is also the area under the normal distribution curve up to Z....
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Answered by Holi A. • Maths tutor
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I am finding it hard to come up with idea's during my speaking exam. How can I make the conversation flow better?

This is a problem many people deal with, so you are not alone. During oral exams, we can feel so under pressure that our minds go blank and we forget everything we learnt. There are several ways to overcome ...
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Answered by Lucie G. • French tutor
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What's the difference between the 'lock and key' and 'induced fit' models for enzymes?

The lock and key hypothesis suggests that the enzyme has a fixed shape/structure and the substrate has to fit into this exactly for catalysis to occur. The induced fit hypothesis is different in that it sugg...
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Answered by Harriet W. • Biology tutor
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