4 Written questions
4 Multiple choice questions
- causes disease in tobacco plants.
- contain RNA or DNA in a protein coat.
- is the protective outer coat.
- bacterial viruses with a polyhedral head & a helical tail.
4 True/False questions
the study of viruses → is the protective outer coat.
viroid → contains only a nucleic acid.
Viruses → have nuclei & organelles.
clearcutting of forests → is a part of biology because they are active inside living cells.