True or False : 1. Carbon fixation can be described as a process by which gaseou

Question

True or False :

1. Carbon fixation can be described as a process by which gaseous carbon-containing molecules

are captured and incorporated into biological hydrocarbon molecules.

2. The electron-transport proteins, utilized in stage 1 of photosynthesis, reside in the inner membrane of the chloroplast.

3. Similar to oxidative phosphorylation in mitochondria, the electrons passed along the chloroplast electron-transport chain are ultimately passed on to a molecule of O2, to produce H2O.

4. Stage 2 of photosynthesis (the Calvin Cycle) involves a cycle of reactions that does not directly depend on energy derived from sunlight.

Explanation / Answer

1. Carbon fixation can be described as a process by which gaseous carbon-containing molecules

are captured and incorporated into biological hydrocarbon molecules.True

2. The electron-transport proteins, utilized in stage 1 of photosynthesis, reside in the inner membrane of the chloroplast.True

3. Similar to oxidative phosphorylation in mitochondria, the electrons passed along the chloroplast electron-transport chain are ultimately passed on to a molecule of O2, to produce H2O . False

explanation:

In chloroplasts, light drives the conversion of water to oxygen and NADP+ to NADPH with transfer of H+ ions across chloroplast membranes. In mitochondria, it is the conversion of oxygen to water, NADH to NAD+ and succinate to fumarate that are required to generate the proton gradient.

4. Stage 2 of photosynthesis (the Calvin Cycle) involves a cycle of reactions that does not directly depend on energy derived from sunlight.True

explanation:

Dark reactions or Light independent reactions, converts corbondioxide into carbohydrate by using ATP and NADPH. This process also called as carbon fixation or carbon reaction since carbon is fixed during this reaction. It occurs in stroma of chloroplast. There are three pathways occurs in dark reaction, namely Calvin cyle, C 4 pathway and CAM pathway.

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