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Advanced Higher Bio

Unit 1 Photoreceptors

QuestionAnswer
what three organisms have photoreceptors archaea, plants & animals
What is the photoreceptor molecule in archaea bacteriorhodopsin
What is the photoreceptor molecule in plants and in what membrane structure is it found photosynthetic pigments (chlorophyll) in thyalkoid of chloroplasts
What is the photoreceptor molecule in animals and in what membrane structure is it found rhodopsin in retina membrane
What is rhodopsin made up of opsin and retinal
What is the function of retinal light sensitive molecule in membrane
What are opsin molecules (membrane) proteins
What is the function of rods versus cones cones detect colour whilst rods detect light at low light intensity
How are rods well adapted for their function absorb wider wavelengths of light OR a very high degree of amplification results in sensitivities at low light intensities.
How are cones well adapted to their functions have more than 1 type of opsin whereas rods only have one type
Explain how archaea photoreceptors work bacteriorhodopsin absorbs photons of light which cause H ions to move across protein pump by AT and diffuse across ATP synthase to make ATP
What molecule is pumped across membrane following excitation of light by bacteriorhodopsin Hydrogen
Explain how photoreceptors in plants work chlorophyll absorbs photon of light which excites e that pass along ETC providing energy for H ion to be pumped across membrane & diffuse back across ATP synthase making ATP
Explain how rhodopsin absorbs light in the human eye 1 photon of light is absorbed by retinal which activates 100 G proteins which activate 1000 enzymes which close Na channels causing depolarisation creating nerve impulse
Each opsin protein is for a specific colour. What FOUR wavelengths are they adapted to see red, green, blue & UV
Do rods or cones have rhodopsin rods only
What is pumped across the membrane in archaea Hydrogen
In animals what happens after 100's of G proteins have been activated 1000's of enzymes activated
What happens after 1000's of enzymes activated in animal vision Na channels close/hyperpolarisation is sufficient product made
What happens after Na channels close nerve impulse generated due to hyperpolarisation
Created by: kyle_academy
 

 



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