All living organisms use 20 amino acids to build their proteins, reflecting a common ancestry. What makes the amino acids different from one another?

The answer to your question is below

Explanation:

Amino acids are organic molecules which are the bricks of proteins. The order of amino acids determines the different kinds of proteins that they can form.

As their name mentions, all amino acids have an amine group and a carboxylic acid group. We can differentiate them because of the group R of the central carbon.

See the picture below.

R can be    -CH₃ , - COOH, -CH₂CH₃, etc, R is different for each amino acid.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the answer is   c.) 1575 j.

explanation: