BIOLOGICAL CLASSIFICATION
VIRUSES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
High mutation rate due to lack of proofreading of RNA genome replication errors.
|
|
|
Transcription from the host cell RNA polymerase introduces numerous mutations.
|
|
|
Capsid proteins from the host cell can replace the viral capsid.
|
|
|
Viral RNA is translated by host cell ribosomes.
|
Detailed explanation-1: -The multiple sources of genetic variation include mutation and genetic recombination.
Detailed explanation-2: -Viral variation can be generated by a number of mechanisms. Major rearrangements in genome structure and organisation can occur by genetic recombination. Gene duplications, gene exchanges and gene adoptions also occur. However, the most common form of variation is mutation by nucleotide substitution.
Detailed explanation-3: -Viral recombination occurs when viruses of two different parent strains coinfect the same host cell and interact during replication to generate virus progeny that have some genes from both parents.
Detailed explanation-4: -Two mechanisms are the main sources of genetic variation in viruses during their evolutionary process: mutation and genetic exchange.