The approximately 20 basic building blocks of protein are called
a. amino acids.
b. lipids.
c. lipoproteins.
d. triglycerides.

AMINO ACIDS

Explanation:

When the amino acids are linked by dehydration process to form peptide bonds protein is formed.  

Amino acids are organic compounds which contain both the amine group (-NH2 ) and the acid group (-COOH ).  

Peptide bond:

Peptide bond is a link between amino acid through the acid group ( -COOH) of one amino acid to the amine group (-NH2 ) of other amino acid. This peptide bond is shows as follows:

-CO-NH-

Essential amino acids:

These amino acids are also known as indispensable amino acid. An essential amino acid is that cannot be synthesized by the living organism, means by biosynthesized. It must be supplied only by its diets. The following are essential amino acids with three letter and one letter abbreviations:

1.Histidine, His, H

2.Isoleucine, Ile, I

3.Leucine, Leu, L

4.Lysine, Lys,K

5.Methionine, Met, M

6.Phenylalanine, Phe, F

7.Threonine, Thr, T

8.Tryptophan, Trp, W

9.Valine; Val, V

Nonessential amino acids:

These amino acids are also known as conditionally essential amino acids. A nonessential amino acid is that can be synthesized by the living organism means by biosynthesized. The following are nonessential amino acids with three letter and one letter abbreviations:

1.Alanine; Ala, A

2.Arginine, Arg,R

3.Asparagines,Asb,N

4.Aspartic acid, Asp, D

5.Cysteine, Cys ,C

6.Glutamic acid, Glu, E

7.Glutamine,Gln,Q

8.Glycine; Gly, G

9.Proline, Pro, P

10.Serine, Ser, S

11.Tyrosine,Tyr,Y

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

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