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Vocabulary notes

play a role (in) – відігравати роль

both…and… – як…так і…

rich in – багатий на

range from…to… - (коливатися) в межах від…до…

II. Complete the sentences with the appropriate phrases from the vocabulary notes

  1. Having a dual attraction, i.e., containing _______ a lipid-soluble _______ a water-soluble region is basic to the role of lipids as building blocks of cellular membranes.

  2. Actin filaments _______ _______ structural _______, forming a dense complex web just under the plasma membrane.

  3. The outer surface of the membrane will tend to be _______________ glycolipids, which have their hydrophobic tails embedded in the hydrophobic region of the membrane and their heads exposed outside the cell.

  4. The carbon dioxide released by cells is generated by the Kreb's Cycle, as are the energy carriers (NADH and FADH2) which _______ _______ _______ in the next step.

  5. The ultimate limit to the resolution of a light microscope is set by the wavelength of visible light, which _______ _______ about 0.4 μm (for violet) _______ 0.7 μm (for deep red).

  6. The internal membranes of eukaryotic cells differ _______ structurally _______ chemically from the plasma membrane.

  7. Speculative forms of extraterrestrial life _______ _______ humanoid and monstrous beings seen in works of science fiction _______ life at the much smaller scale of bacteria and viruses.

  8. Citrus fruits are _______ _______ vitamin C.

IV. Choose the correct option. In some cases more than one answer is possible

  1. Carbohydrates are substances which include:

a) carbon, nitrogen and water; c) carbon, oxygen and hydrogen;

b) oxygen, hydrogen and water; d) carbon, oxygen and water.

  1. To the carbohydrate group belong such substances as

a) sugars, starch and glycogen; c) glycogen, cellulose and dextrin;

b) cellulose, enzymes and dextrin; d) oils, sugars and starch.

  1. Different organisms can store energy in:

a) cellulose and lipids; c) glycogen and lipids;

b) starch and triglycerides; d) triglycerides and glycogen.

  1. Lipids do not dissolve in:

a) ether; c) water;

b) organic solvents and water; d) alcohol and other organic solvents.

  1. Lipids do not perform the following functions:

a) participate in the regulation of transport across the cell membrane;

b) catalyze important reactions taking place in the cell;

c) serve as important energy reserves;

d) form protective coatings for plant leaves.

  1. Proteins are important because they:

a) serve as structural material for organisms;

b) provide protection from a wide range of infectious agents and toxic substances;

c) store hereditary information and pass it to next generations;

d) can be used as energy reserves.

  1. Nucleic acids are believed to have been formed

a) at the time when the most primitive living forms appeared on the earth;

b) together with the first multicellular organisms;

c) 4,5 billion years ago;

d) in the primordial soup.

V. Think of possible questions for the following answers

    1. They are produced by green plants and by bacteria in the process of photosynthesis.

    2. The most important of them is glucose.

    3. These are cellulose and hemicellulose.

    4. Animals use glycogen for this purpose.

    5. No, they can only dissolve in alcohol, ether and other organic solvents.

    6. They were discovered in 1838.

    7. 30,000.

    8. This problem is still being researched.

    9. It resembles a double helix.