Check Yourself

Ex. 1 Choose the correct word corresponding to the following definitions

parasite a) Body – building substance essential to good

health, in such food as milk, eggs, meat.

microscopic b) Substance used in, or obtained by chemistry.

protein c) A group of microscopic, onecelled fungus plants.

chromosome d) Organical chemical substance (a catalyst)

formed in living cells, able to cause changes in

other substances without being changed itself.

chemical e) Animal or plant living on or in another and

getting its food from it.

bacteria f) A microorganism that is capable of growing in the

complete absence of oxygen.

fungus g) Plant without leaves, flowers or green coloring

matter, growing on other plants or on decaying

matter.

virus h) Microscopic unit of living matter enclosing

a nucleus with self – producing genes.

cell i) Any of various poisonous elements, smaller than

bacteria, causing the spread of infectious disease.

pathogen j) A scientific instrument that makes extremely small

things look larger.

prokaryote: k) Organism with a simple DNA chromosome

without a nuclear membrane and possessing a

small range of organelles.

enzyme l) A microorganism associated with disease.

anaerobe m) One of the minute threads in every nucleus

in animal and plant cells, carrying genes.

Ex. 2 Fill in the blanks with the suitable word

bacterium / strain / microbiology / cell / viruses / organisms / spiral / bacteria / origin / diseases / microscope / diploccocus

To see microbes, you need a …………...

………….. can destroy the …………. they invade.

Microbes are small..............., generally smaller than human eyes can detect.

The …………… Borrelia burydorferi has …………… form.

…………… of eukaryotes remains obscure and speculatic.

Infectious.………… have played major roles in shaping human history.

Industrial ………….. came of age in the 20 th century.

..................is a pair of cocci.

Some …………. help make pharmaceuticals.

…………..is a group of organisms of the same species, having distinctive characteristics but not usually considered a separate breed or variety.

Ex. 3 In each of the following sentences there is one mistake. Find it and

Correct it

1. How microbes are small?

2. Microbes can live as a single sell.

3. We have knowed this disease for ages.

4. He reads the books about enzymes at that moment.

5. They by fission reproduce.

6. Where viruses act?

7. Many protozoans prey on soil bacteria.

8. What does lead to disease?

9. A virus lives inside a houst cell?

10. Students examined molds under the microscope from 9 to 10 yesterday.

Ex. 4 Make up questions to the following statements

1. That filter stopped ordinary bacteria.

2. Human immunodeficiency virus can damage organs directly.

3. The exact nature of the viruses has not yet been settled.

4. Several types of microbes will be seen.

5. The scientists want some bacteria to make pesticides.

6. A virus that causes yellow fever in man was found in 1901.

7. Rickettsia are larger than viruses.

8. The largest known virus measures 450 millimicrons.

9. Bacteria are being put to work in wondrous ways.

10. Some biochemical examination should be carried out.

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