III. Answer the questions to the text:

1. What are amino acids?

2. What do they form when they are linked together?

3. What are they important in?

4. How do we call short and long chains of amino acids?

5. What is translation?

6. What is the amount of amino acids?

7. What amino acids do we call essential and semi- essential?

IV. Complete the following sentences about Essential amino acids using the words and phrases in the box.

abundantly; blood pressure;formation; levels;recovering; anti-oxidant; nails; breakdown; detoxify; transmits; aids; acid; proper; repair; damage; arthritis; diminish; maintain; anxiety.

Essential amino acids

Histidine is found 1)_____ in hemoglobin and is essential for the growth and 2)_____ of tissues, needed for the production of both red and white 3)_____ cells, protects the body from radiation 4)_____, lowers blood 5)_____, aids in the removal of heavy metals from the body. It has been used in the treatment of rheumatoid 6)_____, allergies, ulcers, and anemia.

Isoleucine is needed for hemoglobin 7)_____, stabilizes and regulates blood sugar and energy 8)_____. It is valuable to athletes because it aids in the healing and repair of muscle tissue, skin, and bones. It has been found to be deficient in people suffering from certain mental and physical disorders.

Leucine works with isoleucine and valine to promote the healing of muscle tissue, skin, and bones. It is recommended for those 9)_____ from surgery, lowers blood sugar levels, and aids in increasing growth hormone production.

Methionine is a powerful 10)_____ and a good source of sulfur, which prevents disorders of the hair, skin, and 11)_____. It assists the 12)_____ of fats, thus helping to prevent a buildup of fat in the liver and arteries that might obstruct blood flow to the brain, heart, and kidneys. It helps 13)_____ harmful agents such as lead and other heavy metals. It helps 14)_____ muscle weakness, prevents brittle hair, and protects against the effects of radiation.

Phenylalanine is used by the brain to produce norepinephrine, a chemical that 15)_____ signals between nerve cells in the brain. It promotes alertness and vitality; elevates mood, decreases pain, and aids memory and learning. It is used to treat arthritis, depression, menstrual cramps, migraines, obesity, Parkinson's disease, and schizophrenia.

Threonine helps 16)_____ proper protein balance in the body and is important for the formation of collagen, elastin, and tooth enamel. It 17)_____ liver and lipotropic function when combined with aspartic 18)_____ and methionine. It prevents the buildup of fat in the liver and assists metabolism.

Tryptophan is a natural relaxant and helps alleviate insomnia by inducing normal sleep. It reduces 19)_____ and depression and stabilizes mood and helps in the treatment of migraine headaches. It helps the immune system function properly. It aids in weight control by reducing appetite and enhances the release of growth hormones.

Valine is needed for muscle metabolism and coordination, tissue repair, and for the maintenance of 20)_____ nitrogen balance in the body. It is used as an energy source by muscle tissue.