P I and PII are proteic compounds present in the thylakoid membrane that contain about 300 chlorophyll molecules each.
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<u>Step I</u></em></h2>
First of all light with a wavelength of 690nm is absorbed by P II. The light excites an electron that leads to the photolysis of water(H2O--->2H+ +2e- + 1/2O2). The two electrons released go into the electron transport chain. The second compound in electron transport chain is plastoquinone that is reduced when it accepts electrons then oxidised when it loses them to P I. The next two compounds are cytocromes that make hydrogen protons go inside the thylakoid when they recieve the electrons.(I will mention what happens to the H+ in the second step). The next compound in the electron transport chain is a compound that contains Fe and S. The electrons finally reach the last step: Reduction of NADP+ to NADPH+H+.
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Step II</u></em></h2>
In the second step is ATP synthesis. Hydrogen protons accumulate inside the thylakoid membrane. An electrochemical gradient is formed. The protons can leave the thylakoid according to this gradient through an enzyme.
When the protons flow through , it turns ADP into ATP.
<u>To sumarize: the role of P II is O2 production through photolysis and ATP synthesis(indirectly) The role of P I is NADPH+H+ synthesis.</u>
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Calcium in milk which is food because we drink it
Answer:
It would be A
Explanation:
I took the same test. And got it right.
Selective breeding is breeding between two animals of similar characteristics. cross breeding occurs when two animals from the same species create a new breed. such as when a husky and wolf have a puppy. they are the same species but different breeds.
The correct answer is mitral valve prolapse.
The condition takes place when the leaflets of the mitral valve prolapse (bulge) into the left upper chamber, that is, left atrium of the heart, like a parachute at the time of contraction of the heart.
The symptoms of the condition are dizziness or light-headedness, irregular heartbeat, shortness of breath, chest pain that is not due to any coronary heart disease or heart attack, and fatigue.
The signs of mitral valve prolapse include a crisp mid-systolic click, succeeded by a late systolic mumble if regurgitation is existing.
