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Notes to the texts:

It is noteworthy… – Заслуговує на увагу…

composed of… – що складаються з…

without being consumed – таким чином, що вони не поглинаються

three-dimensional – тривимірний

IV. Answer the following questions to check how carefully you have read the text:

1. How many main classes of large biological molecules are there? What are they? 2. What helps to explain how a molecule works? 3. Is the diversity of macromolecules in the living world enormous? 4. What do carbohydrates include? 5. What are the simplest carbohydrates? 6. What are polysaccharides? 7. What are lipids? 8. Can lipids mix with water? 9. What are the most biologically important types of lipids? 10. What role do proteins play in an organism? 11. What are the most structurally complex molecules? 12. What kind of shape does each type of protein have? 13. What are the two types of nucleic acids?

Vocabulary exercises

I. Translate the following words and word combinations into Ukrainian and use them in the sentences of your own:

it is noteworthy that …; different kinds of; to vary from … to; also known as; common; to be not … enough; some …, while others …; to play a role; to enable; from one generation to the next; to provide.

II. Choose the synonyms of the following words from the text. Translate them:

to vary, vast, diversity, enough, to determine, trait, to mix, to mean, to speed up, defense

sufficiently, to identify, feature, to combine, variety, to differ, enormous, to stand for, to accelerate, protection

III. Choose the antonyms of the following words from the text. Translate them:

rich, immense, dynamic, roughly, individual, dry, sophisticated, to enable, direct, different, foreign

tiny, indirect, accurately, collective, similar, native, poor, inactive, wet, to forbid, simple

VI. Translate the following sentences into Ukrainian paying attention to the word mean:

1. We have all means to produce good results in our work. 2. We improve soil structure by means of proper crop rotation. 3. What does this word mean? 4. If the lecture takes place I will come by all means. 5. Like some people you didn’t understand the meaning of this work. 6. His colleagues thought he looked terribly aged, although he was by no means an old man.

V. Match the word (1-10) and its definition (a-j):

1. molecule

a. a polymer (polynucleotide) consisting of many nucleotide monomers; the two types are DNA and RNA

2. carbohydrate

b. the simplest carbohydrate, active alone or serving as a monomer for disaccharides and polysaccharides

3. lipid

c. a polymer of many monosaccharides, formed by dehydration reactions

4. protein

d. a type of lipid characterized by a carbon skeleton consisting of four fused rings with various chemical groups attached

5. nucleic acid

e. any of a group of large biological molecules, including fats, phospholipids, and steroids, that mix poorly, if at all, with water

6. macromolecule

f. a biologically functional molecule consisting of one or more polypeptides folded and coiled into a specific three-dimensional structure

7. monosaccharide

g. a sugar (monosaccharide) or one of its dimers (disaccharides) or polymers (polysaccharides)

8. disaccharide

h. two or more atoms held together by covalent bonds

9. polysaccharide

i. a giant molecule formed by the joining of smaller molecules, usually by a dehydration reaction

10. steroid

j. a double sugar, consisting of two monosaccharides joined by a glycosidic linkage formed by a dehydration reaction