1 Marsha usually gets up at 9 am on Saturdays. 2 Then, she always has breakfast. 3 She doesn't leave the house early on Saturdays, so he has time to eat. At the moment, she is getting dressed to go down and have some eggs. 4 Mark always goes to Ben's house at the weekend. Right now, they are playing computer games . 5 Mark usually wins but at the moment, he isn't winning. 6 Dana is chatting with her friend online at the moment. She spends about an hour online every night. At the moment, she and her friend are talking about their school day. Her friend is telling her about her dance class.
1 Virology is often considered as a part of microbiology 2 Viruses can be classified according to the host cell they infect: animal viruses, plant viruses, fungal viruses,and bacteriophages (viruses infecting bacteria, which include the most complex viruses). 3 Another classification uses the geometrical shape of their capsid (often a helix or an icosahedron) or the virus's structure (e.g. presence or absence of a lipidenvelope). 4 A virus is a small infectious agent that can replicate only inside the living cells of organisms. 5 Viruses are found in almost every ecosystem on Earth. 6 Viruses cause a number of diseases in eukaryotes. 7 Viral infections in animals provoke an immune response that usually eliminates the infecting virus. 8 The evolution of viruses, which often occurs in concert with the evolution of their hosts, is studied in the field of viral evolution. 9 While viruses reproduce and evolve, they don't engage in metabolism and depend on a host cell for reproduction.
2 Then, she always has breakfast.
3 She doesn't leave the house early on Saturdays, so he has time to eat. At the moment, she is getting dressed to go down and have some eggs.
4 Mark always goes to Ben's house at the weekend. Right now, they are playing computer games .
5 Mark usually wins but at the moment, he isn't winning.
6 Dana is chatting with her friend online at the moment. She spends about an hour online every night. At the moment, she and her friend are talking about their school day. Her friend is telling her about her dance class.
2 Viruses can be classified according to the host cell they infect: animal viruses, plant viruses, fungal viruses,and bacteriophages (viruses infecting bacteria, which include the most complex viruses).
3 Another classification uses the geometrical shape of their capsid (often a helix or an icosahedron) or the virus's structure (e.g. presence or absence of a lipidenvelope).
4 A virus is a small infectious agent that can replicate only inside the living cells of organisms.
5 Viruses are found in almost every ecosystem on Earth.
6 Viruses cause a number of diseases in eukaryotes.
7 Viral infections in animals provoke an immune response that usually eliminates the infecting virus.
8 The evolution of viruses, which often occurs in concert with the evolution of their hosts, is studied in the field of viral evolution.
9 While viruses reproduce and evolve, they don't engage in metabolism and depend on a host cell for reproduction.