The cell. Кулагина Ж.Д. - 7 стр.

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      Ex. 12. Retell text A using the phrases given below as a plan.

1) to consist of, 2) the physical basis of life, 3) a thin granular, nearly transparent
fluid structure, 4) appearance, chemical composition and characteristics, 5)
water, 6) proteins, fats, sugars and mineral salts, 7) to take part in all chief
processes in the body of plants, 8) a deceptively simple appearance, 9) essential
for, 10) to conduct investigations.

      Ex. 13. Report the questions following the rules of the sequence of tenses.

            1. What is a compound microscope? 2. How does the electron
            microscope differ from the compound microscope? 3. Why are most
            compound microscopes more powerful than simple ones? 4. What is
 My
            the difference between an object examined under a compound and
 friend
            electron microscope? 5. Why can't you see cells or protoplasm when
 asked
            you put your finger under the microscope? 6. Has he decided to
 me
            publish the materials of his experiment? 7. What kinds of
            microscopes do you know? 8. What conclusion did he come to after
            reading this book? 9. Will you return this book in time? 10. Do you
            like this book?

      Ex. 14. Listen to text B twice. Translate the sentences in the pauses after
the announcer.

      Ex. 15. Read text B and check the correctness of your translation.

                                      TEXT B
      Physically, ordinary protoplasm is a rather thick liquid somewhat like an
egg white. It is often gelatinous. It varies widely in different parts of the plant
and under different conditions. With even the highest powers of the microscope
protoplasm appears as a clear liquid in which minute granules and globules of
various sizes, types and abundance are suspended. Protoplasm has a
considerable contractility, elasticity and tensile strength.
      In protoplasm a wide variety of chemical and physical changes take place
which we call metabolism. Extremely keen sensitivity of living material to outer
changes is based on the unusual irritability of protoplasm. Furthermore all
growth among organism consists in the increase in amount of living material
which has the ability to convert lifeless organic matter into new protoplasm
exactly like itself.