Question

The genetic code is encased in _______________ sequence.

How many nts are required to code for 20 different amino acids in polypeptides?
What is this called in DNA and RNA?
The genetic code is ___________which means what?
A) Exonic, 3, Codon, Redundant
B) Intronic, 64, Anticodon, Universal
C) Coding, 61, Triplet, Unambiguous
D) Non-coding, 20, Triplet, Degenerate

Answer 1

The genetic code is based on a triplet sequence known as codons that encode for amino acids. There are 61 codons to code for 20 amino acids, revealing that the genetic code is redundant. The correct answer to the student's question is 'Exonic, 3, Codon, Redundant.'

Step-by-step explanation:

The genetic code is encased in a triplet sequence. To code for the 20 different amino acids in polypeptides, 61 nucleotides (nts) are required. These triplets are called codons when they are part of mRNA or DNA.

The genetic code is redundant, which means that while there are only 20 amino acids, there are 64 possible codon combinations because the code is made up of triplets that involve the pairing of any three of the four nucleotides (A, C, G, and U in RNA; A, C, G, and T in DNA). Therefore, most amino acids are coded by more than one sequence of nucleotide triplets.

The correct answer to the student's question is: A) Exonic, 3, Codon, Redundant.