Viruses are non cellular parasitic entities. They cannot line and reproduce outside of living cells since they lack the machinery to do so by themselves. They range in size from 20nm to 250nm.
Viruses are either virulent, destroying the cell in which they occur or temperature, becoming integrated into their host genomes and remaining stable there for long periods of time.
The adhesion properties of viruses are determined by those of the proteins that make up their coats and envelops. The simplest viruses use the enzymes of the host cell for both their protein synthesis and gene replication; the more complex ones contains up to 200 genes and are capable of synthesizing through their host may structural proteins and enzymes.
AIDS is caused by HIV ( Human Immunodeficiency Virus ), which possesses a Glycoprotein on its surface that penetrates the cell membrane, sheds its protective coat and reproduce.
Viruses are either virulent, destroying the cell in which they occur or temperature, becoming integrated into their host genomes and remaining stable there for long periods of time.
The adhesion properties of viruses are determined by those of the proteins that make up their coats and envelops. The simplest viruses use the enzymes of the host cell for both their protein synthesis and gene replication; the more complex ones contains up to 200 genes and are capable of synthesizing through their host may structural proteins and enzymes.
AIDS is caused by HIV ( Human Immunodeficiency Virus ), which possesses a Glycoprotein on its surface that penetrates the cell membrane, sheds its protective coat and reproduce.
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