Viruses

1. DNA viruses

2. RNA viruses

Viruses do not show organization at a cellular level.

They are not technically made up of cells as they have no nucleus, cytoplasm, or cell membrane. 

They do not reproduce through mitosis or meiosis, but instead rely on a host cell to pass on their genetic material. 

Viruses do not require energy and therefore do not perform cellular respiration (creating energy from different molecules).

• Viral DNA makes new RNA which creates more virus proteins

• DNA may just embed itself in host DNA and create more viruses

Viral RNA finds ribosomes in the cytoplasm and builds its own proteins

Retro

• Contains reverse transcriptase enzyme which switches DNA/RNA production

• Creates new DNA from the viral RNA

• New DNA then creates new viral RNA which codes for viral proteins