why does mitochondria has its own DNA and ribosomes?

Answer 1

To help elaborate in monkey terms for your reading pleasure , let me explain what these nerds just said. Once upon a time, Mr cell and Mr. Mito (mitochondria) lived away from each other. They both had DNA to make more of themselves, but something was wrong Mr. Cell was having a tough time getting energy and felt weak and miserable because he wanted to grow and divide and be a super cell. At the same time, Mr. Mito was cold and lonely and needed a place to live where he was safe and where he felt needed and important. One day Mr Cell accidentally ate Mr mito thinking he was something else. Mr Mito was angry, but soon came to realize that life was easier inside Mr. Cell because he was protected and could make all the energy he wanted. Mr. Cell was so happy because he could now use the energy from Mr. Mito to grow strong and become the super cell of his dreams and out live all of the other cell. They were both happy now and agreed to stay together forever--and they evolved happily ever after. We will read about Mr.Ribosome and his misfit RNA issues another night.

Answer 2

Do Mitochondria Have Ribosomes

Answer 3

Scientists believe that mitocondria was originally a bacteria that had a symbiotic relationship with us. The mitochndria allowed us to maximise our use of oxygen to have better metabolism and the mitochondria got nutrients and shelter from us. Over time we evolved to keep the mitochondria within us but because the mitochondria was not originally part of us it has its own DNA! Did you know that mitochondria is exclusively maternally inherited? That means that only a mother can pass her mitochondria to her offspring! So a mother will give her motochondira to her kids, her daughters will pass on the same mitochondria to their kids, but her sons kids will get their wife's mitochondria! Understand? This is one of the ways to trace your lineage back ages. Just like the mitochondria is exclusively maternally inherited, the Y-chrosome is exclusively paternally inherited- anothjer way to trace lineage! Using mitochondria and Y-chromosome data is how scientists theorise that lifew originated in Africa, since the earliest mitochondrial DNA types are found in people from Africa!

Answer 4

Mitochondria evolved from prokaryotic ancestors. Because they once lived independently as separate organisms they have remnants of their old DNA within them.

Interestingly many of the genes on the mDNA (mitochondrial DNA) have moved to the nuclear DNA chromosomes.

The reason why mitochondria have their own ribosomes is because prokaryotic genes are translated by different (smaller) ribosomes. Thus, the old prokaryotic genes in mitochondria are translated by prokaryote like ribosomes.

Answer 5

Biologists believe that the mitochondria was an external organism, that worked with the human cell. The human cell then ate the mitochondrion up so that it could function in the human cell itself. Perhaps this is for convenience. This also explains why the mitochondrion has 2 cell membranes. The innermost one is from the original organism while the outer one is from the human cell.

This also applies to the chloroplasts of a plant cell.

Answer 6

Scientists say that at some point of time mitochondria were external organisms (like bacteria etc). They entered into a symbiotic relationship with the animal cells at a very early stage of development- a stage where uni-cellular organisms were just about evolving into multi-cellular ones. Hence today they are found in all animal cells.

Answer 7

the mitochondria with the aid of fact it harvest capacity to make ATP(cellular respiratory) IT is composed of ITS very own DNA and ribosomes. Chloroplast does not be an answer with the aid of fact it incorporates out photosynthesis having to do with flora. it incorporates a chlorophyll and makes glucose.

Answer 8

as mitochondria has its own membrane and is not part of endomembrane system .It doe not have own RER for prtein synthesis(for own membrane) so as being an independent bacterium it has its own DNA and ribosomes .As ribosome are sites of protein synthesis and DNA programs this synthesis on ribosomes of mitichondrion.This is why it has its own ribosomes and DNA.

Answer 9

Because it evolved from an organism that had a symbiotic relationship with another organism that eventually evolved into an animal cell.

Why do you we have bacteria in our stomach?

Answer 10

Because it is supposed to have lived separately in the past, as an independient bacteria.