Question

Indicate if the following feature is found in chloroplasts, mitochondria, or both:

1. Electron-transfer reactions

2. Carbon fixation

3. Inner membrane

Answer 1

1. Electron-transfer reactions

The mitochondria convert energy from chemical fuels. For mitochondria the electron carriers is NAD+. It takes up two electrons to become NADH. The entire set of proteins in the membrane, together with the small molecules involved in the orderly sequence of electron transfers, is called an electron transport chain.

The chloroplast converts energy from sunlight.chloroplast has photosystems, where light energy is captured by green pigment chlorophyll and harnessed to drive the transfer of electrons. Electrons are taken from water to produce oxygen and are transferred to carbon dioxide to synthesize carbohydrates. (via NADPH ). chloroplast generates oxygen and carbohydrate, whereas the mitochondria consume them.

2.carbon fixation

Carbon fixation takes place at the membrane system of the chloroplast. In carbon fixation reactions the ATP and the NADPH produced by the photosynthetic electron transfer serve as the source of energy to drive the conversion of carbon dioxide to carbohydrate.

3.Inner membrane

The inner membrane of mitochondria is folded into cristae. In chloroplast inner membrane rises into flattened sacs called as Thylakoids