Till we have studied that viruses contain RNA ,do they also contain DNA?

Answer 1

Both DNA and RNA are found in viral species, but generally a species will not contain both. One exception is the human cytomegalovirus, which contains both a DNA core and several mRNA segments. The nucleic acid can be either single- or double-stranded, depending on the species. Therefore viruses as a group contain all four possible types of nucleic acids: double-stranded DNA, single-stranded DNA, double-stranded RNA and single-stranded RNA. Animal virus species have been observed to possess all combinations, whereas plant viruses tend to have single-stranded RNA. Bacteriophages tend to have double-stranded DNA. Also, the nucleic acids can be either linear or a closed loop.

Genome size in terms of the weight of nucleotides varies quite substantially between species. The smallest genomes code for only four proteins and weigh about 10^6 daltons, while the largest weigh about 10^8 daltons and code for over one hundred proteins. Some virus species possess abnormal nucleotides, such as hydroxymethylcytosine instead of cytosine, as a normal part of their genome.

For viruses with RNA as their nucleic acid, the strands are said to be either positive-sense (also called plus-strand) or negative-sense (also called minus-strand) depending on whether it is complementary to viral mRNA. Positive-sense viral RNA is identical to viral mRNA and thus can be immediately translated by the host cell. Negative-sense viral RNA is complementary to mRNA and thus must be converted to positive-sense RNA by an RNA polymerase before translation.

All double-stranded RNA genomes and some single-stranded RNA genomes are said to be segmented, or divided into separate parts. Each segment may code for one protein, and they are usually found together in one capsid. Not all segments are required to be in the same virion for the overall virus to be infectious, as can be seen in the brome mosaic virus.

Answer 2

Not all of them. Some viruses contain DNA, some only RNA and some RNA that codes for DNA and then codes back to RNA (HIV virus for example) but does not have DNA in themselves. Tha genetic material of viruses are one aspects used to classify viruses.

Answer 3

viruses can have for types of genetic material. Single stranded DNA, Single stranded RNA, double stranded DNA, and Double stranded RNA.

Answer 4

of course viruses contain DNA T2 virus or bacteriophage contains dna..

Answer 5

All viruses have some sort of DNA dependent upon the source.

Answer 6

yes , anything inside the body would contain DNA. .

Answer 7

yes their are some dna viruses such as HEPATITIS virus...

Answer 8

Dahfna is correct. Ignore the two first answers, they are wrong.

Answer 9

no they don't posses DNA as they don't reproduce & also not show many living characterstics.