Question

5. From the following choices below, identify those that are the inputs and outputs of the Photosystem I and II light reactions. (Recall that inputs to chemical reactions are modified over the course of the reaction as they are converted into products. In other words, if something is required for a reaction to occur, and it does not remain in its original form when the reaction is complete, it is an input.) Put each item below to the appropriate category of "input" or "output". If the item is not an input to or an output from the light reactions, put it in the category of "not input or output". (2 pts) Choices - Light, Glucose, NADP+, NADPH, O,, CO2, water, Glyceraldehyde-3-Phosphate, ADP, ATP

Answer 1

There are 2 photosystem(PS) included in the the photosynthetic light reactions- PS1 and PS2. PS1 has a reaction center which is P700 and PS2 has P680. These photosystems with reaction centers get activated on the light exposure and the cyclic or non-cyclic electron flow starts.

The input of PS2 is light with photon energy of 680nm, Water molecule which gives electron on splitting, ADP as energy source and prorons. On the output it gives ATP molecules, Oxygen and Electrons.

The input of PS1 is again light to activate the photons at 700nm wv, NADP+ and the electrons which are produced in PS2. And the output is NADPH.

	Input	Output	Not Input or Output
Choices	Light ADP H2O NADP+	ATP O2 NADPH	Glucose Glyceraldehyde-3-Phosphate