AP BIOLOGY

Detailed explanation-1: -It had long been known that only 20 amino acids occur in naturally derived proteins. It was also known that there are only four nucleotides in mRNA: adenine (A), uracil (U), guanine (G), and cytosine (C).

Detailed explanation-2: -Your body needs 20 different kinds of amino acids to function correctly. These 20 amino acids combine in different ways to make proteins in your body. Your body makes hundreds of amino acids, but it can’t make nine of the amino acids you need. These are called essential amino acids.

Detailed explanation-3: -At least one type of aminoacyl tRNA synthetase exists for each of the 20 amino acids; the exact number of aminoacyl tRNA synthetases varies by species.

Detailed explanation-4: -In the human body, there are 20 amino acids that function as building blocks of proteins. Nine of these amino acids are considered essential-they must be consumed in the diet-while five are considered nonessential in that they can be made by the human body.

Detailed explanation-5: -Roughly 500 amino acids have been identified in nature, but just 20 amino acids make up the proteins found in the human body. Let’s learn about all these 20 amino acids and the types of different amino acids.