The cell. Кулагина Ж.Д. - 39 стр.

                                         39
1. He suggested the question be discussed at the next meeting. 2. They propose
that the work should begin at once. 3. The scientists propose that a special
commission be set to investigate the causes of this disease. 4. The professor
demanded that the postgraduates be allowed to take part in the experiment. 5. It
is desirable that all take part in the experiment. 6. They insisted that the question
be included on the agenda.



                                         C
1. It is important that he be here. 2. It is of first importance that the selected
variety be adapted to the region in which it is to be grown. 3. It is necessary that
a preliminary reaction be essentially complete. 4. Roentgen suggested that the
rays characterized by great penetrating power should be called X-rays. 5. In
order to determine whether a given compound is organic it is sufficient to heat
it. 6. It is known that the meeting will be held at 9 p.m.

      Ex. 18. Read the text.

                                      Text C
        The Specific Features of Metabolism in Different Organisms.
       Physiologists assume some cells and unicellular organisms to have a very
intensive metabolism, while others have such a low level that it is difficult at
times to observe it.
       The metabolism of different species of animals and plants may have
specific features. They depend on a number of factors and are quite individual.
Moreover, within one organism metabolic activity proceeds with different
intensity and has specific features in various organs, tissues and even cells.
       For this process to be understood better you must keep in mind that the
specific character of metabolism depends on age (the younger the organism, the
higher is its metabolism), sex and state of health. Geographical conditions,
climate and season of the year are also to be taken into consideration.
       One of the important indices of the intensity of metabolic activity in
animals is body temperature. Some animals can not maintain their body
temperature constant and are therefore cold-blooded (fishes, reptiles and
amphibia are to be referred to this group). In the long course of their evolution
birds and mammals have evolved the faculty of maintaining the intensity of their
metabolism at high level so that they have a constant, high body temperature.
They are therefore known as warm-blooded. In a number of them, however, the
temperature falls sharply when their bodies are overchilled. Thus the normal
body temperature of the hedgehog is 33.5°C, of the hamster 37.8°C and of the
marmot between 36°C–38°C. However, scientists have found their temperatures
to fall to 4 °C and even to 1 °C when they hibernate. A marked decrease in