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The viral protein coat is called the capsid and is made of smaller subunits called capsomeres. These capsomeres are arranged in helical or polyhedral geometric forms around the nucleic acid.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Kingdom Monera - Archaebacteria and Eubacteria
Viruses exhibit patterns in their genetic material based on their host. The NCERT textbook specifies that viruses infecting plants generally have single-stranded RNA, and those infecting animals have single/double-stranded RNA or double-stranded DNA. However, 'bacteriophages' (viruses infecting bacteria) are definitively and 'usually double-stranded DNA viruses', which they inject directly into the bacterial host cell for replication.
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.6 Viruses, Viroids, Prions and Lichens
Viruses consist of a protein coat shielding genetic material. According to the NCERT Class 11 Biology text, a fundamental biological rule regarding viral genomes is that 'no virus contains both RNA and DNA'. A virus is either an RNA virus or a DNA virus. The genetic material is the sole infectious component that hijacks the host's cellular machinery to replicate itself.
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.6 Viruses, Viroids, Prions and Lichens
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