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2. Questions to think about.

  1. Describe viruses. Are they considered living?

  2. What might account for the origin of viruses?

  3. How do viruses increase in number? Describe the different mechanisms.

  4. What are five diseases affecting humans that are caused by viruses?

  5. Describe similarities and differences between viruses and subviruses.

3. Think of 5-7 statements that would contradict the contents of the text. Language focus

1. Match the words that are: a) similar and b) opposite in meaning:

a)

b)

lysing

to make

terminally

useless

to promote

way

inside

inability

conventional

dissolving

normally

continuously

mode

structure

beneficial

inner

to induce

regular, normal

capacity

abnormally

machinery

to contribute

outer

outside

2. Form the derivatives of the words given in the table (where possible):

Noun

Verb

Adjective

to interfere

to revise

virus

infection

befeficial

to succeed

sore

theory

to elucidate

to transfer

3. Define the following terms:

virus

prions

retroviruses

rhinovirus - ["raInqV'vaI(q)rqs]

influenza viruses - ["InflV'enzq] ['vaI(q)rqsi:z]

bacteriophage - [bxk'tI(q)rIqfeIdZ]

subvirus

AIDS

viral capsid

4. Match the first half of a sentence in column a with the appropriate second half in column b:

A

B

1. Viruses are from 10 to 100 times smaller

a) than to one another.

2. Viruses contain nucleic acids

b) which would explain their small and uncertain molecular weights.

3. Viruses are more closely related to their hosts

c) than the typical bacterium.

4. The mode of prion reproduction might involve fracture and continued growth,

d) that would identify it as living.

5. A virus is inert, incapable of reproduction, or of any metabolic functions

e) which are enclosed in a protective coat of protein.

5. Put the parts of the sentences in the right order:

  1. Not, viruses, metabolize, do, cells, unlike, living.

  2. Cell, within, are, the, host, virus, particles, the, assembled.

  3. Known, the, virus, fastest, virus, mutating, the, influenza, is.

  4. That, any, acids, contain, nucleic, there, no, is, evidence, prions.

  5. Viruses, be, prions, actually, may, conventional.

  6. Are, the, subviruses, infectious, smallest, agents, termed.

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