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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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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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What steps occur during glycolysis?

Glycolysis is a metabolic process that takes place in the cytoplasm of a cell and occurs in both aerobic and anaerobic respiration pathways. One six-carbon compound is converted into two three-day on molecul...
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Answered by Isabelle S. • Biology tutor
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What is a pathogen?

A microorganism that causes disease
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Answered by Emma S. • Biology tutor
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