Complete the sentences using the words from the list

latent, similar, the active compounds, compounds, phytoconstituents, constantly, outside, biological

1. Often it produces a series of structurally related compounds having... pharmacological properties.

2. The inactive... may interfere with the action of the active ones or they may be their precursors.

3. The inactive principles may alter the activity of the drug by physi­cal means, for example, they may act as co-solvents of... or delay their absorption or diffusion in the organism.

4. Sometimes intrinsic factors are... in the plant and only appear as a response to the appropriate external factors.

5. Their biological function is often discussed but the fact is that many of them have a special importance... the plant because of their pharmacological action.

6. Besides their own essential principles, the so-called primary plant products, plants produce other principles, which apparently do not have any definite... function.

7. Plants are... metabolising, both breaking down preformed mole­cules and building new ones at the same time.

8. Nature produces an astonishing variety of complex... which em­brace all fields of pharmacological action.

2. Fill in prepositions where necessary.

1. Sometimes intrinsic factors are latent... the plant and only appear as a response... the appropriate external factors.

2. Drugs... general arise... a heterogeneous population of individual plants living... a variety of conditions.

3. The inactive principles may alter the activity of the drug... physi­cal means,... example, they may act as co-solvents of the active compounds or delay their absorption or diffusion... the organism.

4. Also the inactive compounds may interfere... the action of the active... ones or they may be their precursors.

5. The inactive substances include... cellular structures and pharma­cological inactive... compounds.

6. Besides their own essential... principles, the so-called primary plant products, plants produce... other principles, which appar­ently do not... have any definite biological function.

7. Medicinal plants are important... many reasons: they provide us with natural drugs,... active constituents or... the intermediates... semi-synthetic drugs.

3. Complete the sentences using words and phrases from the text.

1. Nature produces an astonishing variety of complex phytoconstituents....

2. The inactive compounds may interfere with the action...

3. The inactive principles may alter the activity of the drug by physi­cal means, for example....

4. Sometimes intrinsic factors are latent in the plant and only appear as....

5. Their biological function is often discussed but the fact is that many of them have a special importance outside....

6. Besides their own essential principles, the so-called primary plant products, plants produce other principles, which....

7. Plants are constantly metabolising, both breaking down....

8. Nature produces an astonishing variety of complex....

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