Question

Respiration and the light reactions of photosynthesis have several features in common. Which of the following is NOT a common feature? O Both use an electron transport chain. Both couple the energy in Redox reactions to the translocation of protons across a lipid bilayer membrane. O Both have a primary function of reducing NAD+ to NADH Both can generate ATP by using the energy stored in a proton gradient to drive ATP synthase. Both require membranes for key reactions in their respective processes.

Answer 1

Answer -

The correct answer is option 3 - both have primary function of reducing NAD+ to BADH.

EXPLAIN-

• IN light reaction of photosynthesis , NADP+ reduces to NADPH
• In respiration , NAD+ reduced to NADPH
• So we conclude that this is not common feature between light reaction of photosynthesis and respiration.

Option 1 - both use election transportation chain.

Explain- Yes it is common feature. Light reaction have two electron transport chain. Respiration have one electron transport chain.

Option 2 - both couples the energy in redox reaction to the translocation of protons across lipid bilayer membrane.

Explain-

• Yes it is common feature.
• Light reaction of photosynthesis couple the energy in redox reaction to movement of protons across thyllakoid membrane.
• In respiration movement of protons takes place across mitochondrial membrane.

Option 4 - both can generate ATP using energy stored in a proton gradient to drive ATP synthtase.

Explain-

• Yes it common feature.
• Light reaction of photosynthesis and respiration both generate ATP by chemiosmosis process.

Option 5 - both required membrane for key reaction to them respective process.

Explain-

• yes it is common feature.
• Light reaction takes place in thyllakoid membrane of chloroplast.
• Respiration takes place in mitochondrial membrane.

The below diagram show similarities and differences between respiration and photosynthesis

Photosyntheaix 6CO2 + 6H2otlight → Rexpiration C6H2 +60 6 co₂t 64. o Cottino +602 Both Notice how the chemical equations are opposite each. other chemiox moxir- mechani am of ATP generation that occurs when energy it stored in the form of a proton! concentration gradient acroat. a membrane. light Reaction Dark reaction (4 Photosyntheir CAM he&ix photorexpiration Ehloroplaxt alycoly six Krebs cycle ETS Both take orgenelle place in mitochondria Two ETS (electron transport chain Both use ETS (electron transport chain) one electron tranxport chain involve in production 09 NADPH involve in production of NADH and FADH