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III. Writing

1. Match each word from column a with its opposite from column b

A

B

1. chiefly

a. exclude

2. physical

b. insoluble

3. include

c. slowly

4. soluble

d. secondarily

5. rapidly

e. not important

6. primary

f. chemical

7. link

g. bound

8. natural

h. separate

9. together

i. separately

10. free

j. artificial

2. Complete, the following sentences.

1. Organic chemistry is the… .

2. The simplest, organic compounds .... .

3. The carbon atom possesses the property ....

4. The three biggest classes .of the organic compounds are ... .

5. Proteins are made of many ... .

6. The chief groups: of proteins are.... .

7. The most important carbohydrates ... .

8. The carbohydrates are classified ....

9. Lucose, a primary product, of photosynthesis,.... .

10. Lipids are any of a diverse class of organic compounds ... .

3. Answer the following questions.

1. What is organic chemistry?

2. What compounds of carbon do you know?

3. What are the three biggest classes of organic compounds?

4. What are proteins?

5. What proteins do you know?

6. What are carbohydrates?

7. What carbohydrates do you know?

8. What are lipids?

9. What are the functions of proteins, carbohydrates and lipids?

4. Select the appropriate word from the list provided.

A common simple sugar is glucose, a primary product of photosynthesis, present in

every_________ . It occurs in many fruits and is present in the _______ of animals.__________, the so called fruit sugar, is present in fruits. Fructose1 condenses to form________ . Inulin is an important food reserve in some plants. Ordinary sugar (cane-sugar, beet-sugar) is________ . The molecules134 of it are found in plants (wheat, maize, barley, carrots, sugar beet), in most _____________of many plants.

Important polysaccharides_______ , ______ , ________ and_________ . Starch is the most common _______________ in plants (in the seeds, tubers, and in the leaves, as a temporary product of __________). When a drop of potassium iodide solution is placed on a part of the plant, the granules of starch become blue. Starch is an important constituent of foods (potatoes, wheat and others). Glycogen (___________) is a, substance similar to starch occurring in the blood and internal organs, especially liver, of animals. It serves as a reservoir of ______________ .

  • animal starch

  • photosynthesis

  • plant cell

  • include

  • starch

  • glycogen

  • cellulose

  • carbohydrates

  • Fructose

  • blood

  • inulin

  • sucrose

  • food reserve material

  • fruits and leaves

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