Answer:
2. Virus body is made of two types of nucleic acid such as DNA or RNA. Some viruses are made of deoxyribonucleic (DNA) and some are made of ribonucleic acid (RNA).
3. There are five steps which complete the life cycle of virus i. e. attachment, penetration, uncoating, biosynthesis and maturation. Each and every step is important for virus life cycle. Without these steps virus cannot be formed.