BIOLOGY
PROTEINS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
It’s a central carbon with two different groups attached.
|
|
|
It’s a central carbon with three different groups attached.
|
|
|
It’s a central carbon with four different groups attached.
|
|
|
It’s a central carbon with five different groups attached.
|
Detailed explanation-1: -At the “center” of each amino acid is a carbon called the carbon and attached to it are four groups-a hydrogen, an -carboxyl group, an -amine group, and an R-group, sometimes referred to as a side chain.
Detailed explanation-2: -The general structure of an amino acid is: Note the central carbon atom, to which 4 different groups are attached: an amino group (drawn by convention at the left), a carboxylic acid group (put at the right side), a hydrogen, and a side chain, or R-group.
Detailed explanation-3: -Each amino acid has the same core structure, which consists of a central carbon atom, also known as the alpha () carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and a hydrogen atom.
Detailed explanation-4: -There are basically four different classes of amino acids determined by different side chains: (1) non-polar and neutral, (2) polar and neutral, (3) acidic and polar, (4) basic and polar.
Detailed explanation-5: -There is also a hydrogen attached to the central carbon. The last substituent varies between amino acids and determines how the particular amino acid will be used in proteins. This variable group is known as the “R-group.” Only one amino acid, alanine, has a methyl group attached in the “R-group” position.