AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which characteristic can best distinguish between two different proteins?
A
the presence of nitrogen in the proteins
B
the sequence of amino acids in the proteins
C
the number of amino acids found in the proteins
D
the location of the peptide bonds in the proteins
Explanation: 

Detailed explanation-1: -Proteins are high molecular weight compounds. They have a molecular weight of 5 to 300 kilodaltons (1 kilo Dalton = 1.67 * 10-21 grams). They are made of several amino acids. Typically 20 different amino acids synthesize all the necessary proteins.

Detailed explanation-2: -Answer and Explanation: Every amino acid comprises a hydrogen atom, a carboxyl group, an alpha-amino group and also the R-group (which makes the side chain). The side chain present in every amino acid is different. Therefore, the only primary factor that makes each amino acid different is the presence of R-group.

Detailed explanation-3: -Peptide bonds exist in proteins so the Biuret Test can be used to determine whether an unlabeled test tube contained an amino acid or a protein. It is a test that determines the presence of amines and/or amino acids.

There is 1 question to complete.