Question

The movement of electrons down electron transport chains within thylakoids (as well as in mitochondria) is used to create a _________ that is then used to make molecules of _________.

a. splitting water; carbon dioxide

b. pigment; glucose

c. hydrogen ion gradient (high and low H+ areas); ATP

d. glucose molecule; ATP

e. carbon dioxide cycle; oxygen

Answer 1

Option C

Electron transport chain is the process of movement of electron from one electron carrier to the other. All the electron carriers are arranged in increasing order of their electrode potential. Electrode potential defines the affinity of a molecule towards electron. Higher the electrode potential, higher is the affinity for electrons. When electrons are transported from one electron carrier to the other, protons are also pumped across the membrane. This results in the formation of electrochemical gradient across membrane. The electrochemical energy stored in proton gradient is used for the synthesis of ATP by ATP enzyme.

Electron transport chain occurs during both cellular respiration and photosynthesis. During cellular respiration, it occurs in inner mitochondrial membrane and during photosynthesis it occurs in thylakoid membrane.

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