Question

5.7. compare and contrast photosynthesis and cellular respiration. for both of these reactions—photosynthesis and respiration—drag the initial electron donor and terminal electron acceptor to the appropriate electron transport chain. nadp+ as acceptor o2 as acceptor h2o as donor nadh as donor

Explanation:

Step1: Recall photosynthesis electron - transport

In photosynthesis, water ($H_2O$) is the initial electron donor during the light - dependent reactions. The terminal electron acceptor is $NADP^+$, which gets reduced to $NADPH$.

Step2: Recall cellular respiration electron - transport

In cellular respiration, $NADH$ is one of the initial electron donors. The terminal electron acceptor is oxygen ($O_2$), which combines with electrons and protons to form water.

Answer:

Photosynthesis: Initial electron donor - $H_2O$, Terminal electron acceptor - $NADP^+$
Cellular respiration: Initial electron donor - $NADH$, Terminal electron acceptor - $O_2$