Which cell organelles are believed to have once been self-sustaining and independent?

Question

1. Ribosomes
2. Mitochondria
3. Ribonucleic acid
4. Deoxyribonucleic acid

Answer 1

ANS: 2

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1
Ribosomes are small, spherical shaped organelles of the ribosomal ribonucleic acid. They have not likely evolved from self-sustaining or independent organisms.
2
Mitochondria are cellular organelles that have their own DNA. They are believed to have once been independent and self-sustaining but, over the course of evolution, they were incorporated into human cells.
3
Ribonucleic acid is single stranded and can travel to sites outside the nucleus, but ribonucleic acid is not likely evolved from self-sustaining or independent organisms.
4
Deoxyribonucleic acid contains double stranded helical chains containing various sequences of nucleotides. Deoxyribonucleic acid is not thought to have evolved from self-sustaining organisms.