II. Regard the suffixes enlisted below. What parts of speech are formed by means of these suffixes? Find the words containing such suffixes in the text. What do they mean?

-Ance/-ence; -ity; -ness; -ment; -ion/-sion/-tion; -age; -sys; -y; -ty; -ly; -(a)ble; -ive; -en; -ful;-er/-or; -ish; -less.

III. Fill in the following table as in the model

verb	noun	adjective	adverb
dissolve	solute; solution	soluble; insoluble	---
contract
function
reproduce
store
maintain
diversify
connect
recognize
compose
generate

IV. Fill in the spaces in the following text using a suitable form of the word given at the end of the lines. The first is given as an example

Any of the organic compounds required by the body in small amounts for (0) metabolism, to protect health, and for proper (1)______ are referred to as vitamins. Vitamins also assist in the (2)______ of hormones, blood cells, nervous-system chemicals, and (3)______ material. The various vitamins are not (4)______ related, and most differ in their (5)______ actions. They generally act as (6)______, combining with proteins to create metabolically (7)______ enzymes that in turn produce hundreds of (8)______ chemical reactions throughout the body. Without vitamins, many of these (9)______ would slow down or cease. The intricate ways in which vitamins act on the body, however, are still far from clear.

metabolic (0) grow (1) form (2) gene (3) chemical (4) physiology (5) catalize (6) act (7) importance (8) react (9)

LISTENING COMPREHENSION

I. Listen to a fragment of a lecture about DNA structure. Say whether the following statements are true or false according to the text on the tape. Before listening discuss the meaning of the words in the box below with your classmates or teacher

nucleotides nitrogen base complementary base pairing thriving deoxyribose double helix junk

k) Nucleotides are the constituent parts of DNA molecules.

l) Each nucleotide is made up of two main components.

m) There are four types of bases in the DNA structure: cytosine, guanine, thymosine, and adenine.

n) The DNA molecule resembles a double helix or a “ladder” in which the “sides” are made up of bases and the “rumps” consist of phosphate and sugar molecules.

o) The bases in the DNA combine randomly with each other.

p) The mode of base pairing is very important for DNA replication and storage of genetic information.

q) An average human gene includes 100 bases.

r) 98% of a DNA molecule is considered “junk” and useless.

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IV. Choose the correct option. In some cases more than one answer is possible	\|	II. Listen to the following piece of information about cellulose. Fill in the missing words or phrases

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