The light reactions are generally presented in zig-zag patterns,as shown in the accompanying figure.What is the significance of the primary electron receptor shown at position 2 being slightly higher than the primary electron receptor shown at position 3?
A)The electron that has been accepted gains energy as it leaves the primary electron receptor at 2 and heads to the primary electron receptor at position 3.
B)The primary electron receptor at 2 has slightly less energy than the primary electron receptor at position 3.
C)The primary electron receptor at position 2 comes before the primary electron receptor at position 3.
D)Since electrons have given off energy in the electron transport chain,they can be boosted higher by the second photosystem. Answer B

Question

Quizplus · Accepted Answer

The slight difference in height between the primary electron receptors at positions 2 and 3 indicates that the primary electron receptor at position 3 has slightly more energy than the one at position 2. This difference in energy levels is important for the transfer of electrons between the two receptors, as it allows the electron that has been accepted at position 2 to gain energy and move to position 3. This movement of electrons with increasing energy levels is a key aspect of the light reactions and helps to generate the ATP and NADPH needed for the Calvin cycle.

The Light Reactions Are Generally Presented in Zig-Zag Patterns,as Shown