AP BIOLOGY

Detailed explanation-1: -Viruses are smaller and simpler in construction than unicellular microorganisms, and they contain only one type of nucleic acid-either DNA or RNA-never both.

Detailed explanation-2: -At the most basic level, a virus particle is a package containing nucleic acid. The packaging material is protein encoded by the nucleic acid.

Detailed explanation-3: -A virus is made up of a core of genetic material, either DNA or RNA, surrounded by a protective coat called a capsid which is made up of protein. Sometimes the capsid is surrounded by an additional spikey coat called the envelope. Viruses are capable of latching onto host cells and getting inside them.

Detailed explanation-4: -Unlike cells (e.g. bacteria, plant and animal cells), viruses contain either DNA or RNA, never both; the viral nucleic acid is either single or double stranded. Viruses with a DNA core are capable of surviving in the nucleus of the cell they infect, using the host’s biochemical machinery to replicate their DNA.

Detailed explanation-5: -Our results confirm that adenovirus type 5 contains DNA and no RNA, the nucleic acid content of the particles being of the order of 30%. Papilloma virus.