Theoretically, mitochondria are said to be a separate organism that is concerned with its own life and its own processes. In fact, it even duplicates individually. I know a similar question is here but I have something else apart from that to ask.
- Is the presence of their own DNA/RNA - like compound justify or prove that the mitochondria was once a separate living organism?
- If the mitochondria is indeed a separate living organism, then how is it controlled by the nucleus? Or is it not? Logic would suggest that since mRNA exists in the mitochondria separate from DNA in the nucleus, they have their own control over how they behave.
- Often, living organisms working together have to have some sort of payment system. For example, bacteria in the body provide Vitamin K and other breakdown vitamins, and in return the body gives it a suitable home to live in. Is there any such business occurring between the individual cell and the mitochondria? Does it keep some nutrients for itself? If not, what is its mode of nutrition?
- In effect, cells did exist before mitochondria joined the party. Is there any way to at least have a feasible hypothesis on why and how the cells bonded with the mitochondria or how the cells even existed in the first place without the presence of and organnelle that can break down food and convert it into energy?
- Why do mitochondria have their own membrane? And that too folded? Is that to increase the surface area available for the electron transport chain, or is it for simple compactness?
- Why does the mRNA in our bodies always exactly match the mRNA of our mothers and only our mothers? Can any genetic mutation change this fact?
- Is it possible, that a mitochondrion can somehow escape the cell and start performing its life otherwise?
- mRNA would suggest that mitochondria make their own proteins / at least some basic amino acids. If there are any such proteins, are they utilized for the cell? Or are they used for cellular respiration? Or are they kept by the mitochondria for there own means?
I will appreciate all answers!, SmallDeveloper (a.k.a SmallScientist :) )
EDIT : Basically, I am asking 3 things:
- Were mitochondria really separate organisms once?
- If so, how do they get their nutrition?
- How did cells exist before mitochondria came along?