Question

F1 particle occurs in
A. Mitochondria
B. Chloroplasts
C. Ribosomes
D. Rough endoplasmic reticulum.

Answer 1

Hint: The F1 particle is large and can be seen in the transmission electron microscope by negative staining. These are particles of 9 nm diameter that present the inner surface of cristae folds.

Complete answer:
To answer this question, we have to know about the F1 particle. The innermost surface of the cristae membranes of mitochondria which is in the direction of mitochondrial matrix side is covered with a huge number of knob or globular shaped particles with a conspicuous stalk-like structure. Those globular particles are known as racker particles which have been recognized as F1​particles. They act as ATP synthetases and they are uniformly spaced at 10 nm apart. The number of F1​particles present in each mitochondria ranges from 100 to 1000.

Now, let us find the solution from the option.
>F0 and F1 (oxysomes) particles are found in the innermost mitochondrial region and are attached to the cristae and help in ATP production and oxidation.
> F1 particle is found in the matrix of mitochondria and is found attached to the cristae. It performs a very major role in the formation of ATP molecules as it contains an enzyme called ATPase.

Thus, the correct answer is A, i.e. Mitochondria.

Note:The reduced molecules NADH and $FADH_2$ ​are generated by the Krebs cycle, glycolysis, and pyruvate processing. These molecules pass electrons to an electron transport chain, which utilizes the energy released to create a proton gradient across the innermost mitochondrial membrane. ATP synthase then utilized the energy kept in this gradient to form ATP.