Вы и ваши друзья заботятся об экологических проблемах? Почему? Вы когда-нибудь принимали участие в каких-либо экологических проектов в школе? Что бы вы порекомендовали человеку, который хочет улучшить экологическую ситуацию в своем родном городе?
1) John met his boss last week.
John didn't meet his boss last week.
Did John meet his boss last week? When did John meet his boss? Who met his boss last week?
2) Father repaired his car two days ago.
Father didn't repair his car two days ago.
Did father repair his car two days ago? What did father repair two days ago? When did father repair his car?
3) They visited museum last year.
They didn't visit museum last year.
Did they visit museum last year? What did they visit last year? When did they visit museum?
4) Tom brought a cake the other day.
Tom didn't bring a cake the other day.
Who brought a cake the other day? What did Tom bring the other day? When did Tom bring a cake?
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.