Контрольная работа № 3. Для студентов II курса

По английскому языку

Для студентов II курса

Фармацевтического факультета заочного отделения

ВАРИАНТ II

Задание 1: Прочитайте и письменно переведите текст на русский язык.

CLASSIFICATION OF PROTEINS

1. Proteins are complex nitrogenous organic substances of high molecular weight which form an essential part of all living tissues.

2. Enzymes are known to be proteins or to contain proteins as an essential part and all the chemical processes involved in respiration, metabolism and growth are instigated and controlled by enzyme activity.

3. In living tissues proteins are associated with water, they being present in the colloidal state.

4. Their individual behaviour towards environmental changes varies considerably but in general dehydration rise of temperature above 60 - 80^UC and a marked change in pH or in salt concentration result hi their precipitation frequently accompanied by some intermolecular change.

5. When such a change is irreversible the protein is said to be denatured, it becomes permanently insoluble and any enzyme activity is destroyed.

6. For this reason an aqueous or weakly alcoholic extract of fresh tissue contains proteins, whereas an extract similarly prepared from dried tissue is comparatively protein-free.

7, Proteins are classified chiefly according to their solubility; thus albumins are soluble in water, while globulins are insoluble in water but soluble in dilute salt solutions.

8. Both albumins and globulins are coagulated when heated.

9. All proteins are insoluble in organic solvents and in alcohol, though some plant proteins are soluble in 70 per cent alcohol.

10. Solutions or suspensions of proteins in 10 per cent sodium hydroxide yield a pink or purplish-red colour with a trace of copper sulphate solution.

11. Simple proteins are composed of a large number of various amino-acids united together chiefly by peptide (amide) bonds i forming molecules of colloidal dimension.

12. When boiled with dilute acids or when subjected to the action of proteolytic enzymes under suitable conditions the protein molecule is degraded to metaproteins, proteoses, peptones, polypeptides.

13. Natural amino-acids are optically active, amphoteric substances, over twenty of which have been isolated from protein hydrolysates.

14. Most proteins contain nearly all ammo-acids.

 

Задание 2: Перепишите предложения, выделите в каждом сказуемое и определите его время и залог, напишите форму инфинитива, предложения переведите.

1. Russia has achieved great success in many branches of science and technology.
2. The plan had already been discussed when he came.
3. They will not nave built this house by the end of this year.
4. The scientist has already tested this medicine.
5. The text had been translated by the end of the lesson.

 

Задание 3: Перепишите предложения, обратите внимание на Participle II: укажите его функцию, т.е. определите, будет ли оно определением, обстоятельством или составной частью сказуемого; предложения переведите.

1. The compound heated melted slowly.
2. The new discovery will be much spoken about.
3. If used in time, the medicine is more effective.
4. When cooled to the original temperature the substance becomes solid.
5. They have already applied new methods in their research.

 

Задание 4: Учитывая отличительные признаки Gerund и Participle I, выпишите предложения с герундием, определите его функции (подлежащее, определение, обстоятельство, часть сказуемого); предложения переведите.

1. A student was making an experiment
2. When dissolving this substance we observed a very interesting reaction.
3. After stirring at 1 00°C for some hours, the reaction mixture was cooled.
4. Our task was making the experiment
5. His work resulted hi discovering the new phenomenon.
6. Working with the microorganisms we found that they produced antibiotics.
7. Measuring resistance is necessary in many experiments.
8. The problem of synthesizing natural polymers is of great importance.

 

Задание 5: Перепишите предложения и письменно переведите их; определите функцию инфинитива (определение, обстоятельство, дополнение, подлежащее, часть сказуемого).

1. The penicillin to be injected intravenously or intramuscularly must be always freshly prepared.
2. To learn the properties of this or that substance one must carry out a number of experiments.
3. To cool all aqueous solutions of penicillin to certain temperatures is important
4. He was the first to pass all his exams.
5. The purpose of these experiments was to observe properties of the element

 

Задание 6: Переведите предложения, обращая внимание на сложное подлежащее:

1. Proteins are known to be highly complex compounds elaborated by living cells.
2. Most of the chemicals proved to be salts.
3. You are likely to know that the molecular weights of proteins can be estimated only approximately.
4. The data obtained appear to be identical with the previous findings.
5. Many of these proteins are sure to contain elements of carbon, hydrogen» oxygen and nitrogen.

 

Задание 7: Переведите предложения, обращая внимание на самостоятельный причастный оборот:

 

1. D.I. Mendeleyev being a great chemist, his name is well known.
2. The conversation was interesting, many students taking part in it
3. This machine working well, we can use it at our plant.
4. They are tree at S o'clock» their lectures beginning in the morning.
5. The solution having been evaporated, they began to examine the residue left.