A) These have arisen from nucleic acid and protein found in primitive soup
B) These arose from some bacteria as a result of the loss of cell wall, ribosome, etc
C) These arose from some bacteria, which had developed a nucleus only
D) These are modified plasmids, which are infact the fragments of the nucleic acids of the host
Explanation
Many scientists believed that viruses are modified plasmids, which are the fragments of the nucleic acids of the host. These genome fractions escaped and got inducted into new host cells.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.