7. Define virus. Enlist the general properties of viruses.
Answers
Answer:
Viruses are the smallest infectious agents (ranging from about 20 to 300 nm in diameter) and contain only one kind of nucleic acid (RNA or DNA) as their genome. The nucleic acid is encased in a protein shell, which may be surrounded by a lipid-containing membrane. The entire infectious unit is termed a virion.
These are: 1) attachment; 2) penetration; 3) uncoating; 4) replication; 5) assembly; 6)release. As shown in , the virus must first attach itself to the host cell. This is usually accomplished through special glycoprotiens on the exterior of the capsid, envelope or tail.
please mark it as branliest
Answer:
VIRUS - An infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
Explanation:
General Properties of Viruses
1) Nucleic acid -contains 3-400 genes.
2) Capsid -The capsid accounts for most of the virion mass.
3)Envelope -this is an amorphous structure composed of lipid, protein and carbohydrate which lies to the outside of the capsid.
4)Spikes.
5)Icosahedral -The protomeres aggregate in groups of five or six to form the capsomere.