THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
nucleotide
|
|
|
amino acid
|
|
|
purine
|
|
|
pyrimidine
|
Detailed explanation-1: -Each group of three bases in mRNA constitutes a codon, and each codon specifies a particular amino acid (hence, it is a triplet code). The mRNA sequence is thus used as a template to assemble-in order-the chain of amino acids that form a protein.
Detailed explanation-2: -Redundancy in the genetic code means that most amino acids are specified by more than one mRNA codon. For example, the amino acid phenylalanine (Phe) is specified by the codons UUU and UUC, and the amino acid leucine (Leu) is specified by the codons CUU, CUC, CUA, and CUG.
Detailed explanation-3: -There are 64 different codons: 61 specify amino acids and 3 are used as stop signals.
Detailed explanation-4: -The nucleotide triplet that encodes an amino acid is called a codon. Each group of three nucleotides encodes one amino acid.