1.2 Read the following words and give their equivalents in your native language

protons, neutron, electron,calcium, potassium,carbohydrate, protein, lipid, enzyme, hormone, nucleic acid, primary energy source,excess,cause,arteriosclerosis, fingernail, keratin, microbe, vitamin, immunity, catalyst, digestion, stomach, insulin, pancreas, corticosteroid, testosterone, prohibit, associate, masculine, jaundice, heart attack, prohibit, muscle, liver, damage

1.3 Match the words with their definitions

1 break down	A a process that changes the structure and energy content of atoms, molecules, or ions
2 chemical reaction	B not having the structure or organization characteristic of living bodies.
3 compose	C composed of two or more parts, elements, or ingredients
4 compound	D split, or divide into parts
5 inorganic	E derived from living organisms
6 organic	F to make or form by combining things, parts, or elements
7 exist	G next after the first in order, place, time, etc.
8 require	H an irregularity
9 secondary	I to continue to be or live
10 contain	J to have need of; need
11 disorder	K to obstruct (someone or something) by placing obstacles in the way
12 block	L to mix up
13 provide	M a boy or man.
14 confuse	N to hold or include within its volume or area
15 misuse	O forbid
16 derived	P keep within limits
17 male	Q to make available
18 prohibit	R to use wrongly
19 restrict	S any effect of a drug, chemical which is harmful or unpleasant
20 side-effect	T an increasing of speed
21 speed up	U to receive or obtain from a source or origin

1.4 Fill in the blanks with suitable words

1 The mineral that strengthens bone and teeth uses __________.

2 Life on the earth depends on the __________ carbon, which is present in every living thing.

3 Carbon is able to form four chemical ________ with other elements at the same time: carbon, oxygen, hydrogen, and nitrogen.

4 Every important ________ compound is made up of these four elements.

5 All matter, from a rock to an animal is made from different combinations of 92 substances known as__________.

6 The smallest unit of an element that still has the characteristics of that element is known as an_______.

7 Atoms are made up of even smaller particles called _______, protons and _______.

8 Atoms combine with each other in chemical reactions to create ________.

9 Combining two hydrogen atoms with one oxygen atom we create_______.

10 Molecules such as water containing more than one type of element can also be called_______.

11 A hydrogen molecule, which contains only two hydrogen atoms, cannot be called a_______.

12 Inorganic compounds are typically compounds without ________atoms.

13 The chemical compounds of living things are known as ______compounds, because they are carbon-containing compounds

14 Almost all organisms use carbohydrates as a ________ of energy.

15 Lipids are organic molecules composed of carbon, _______ , and oxygen atoms.

16 Proteins, among the most complex of all___________, are composed of amino.

17 Minerals are necessary for three main reasons:building strong bones and teeth, controlling body fluids inside and outside ______ and turning the food you eat into_______.

18 Enzymes are very efficient ________ for biochemical reactions.

Atom, compound, chemical element, water, sources, elements, energy, calcium, organic, compounds, molecules, organic, electrons, neutrons, carbon, catalysts, hydrogen,organic compounds, cells, compounds