AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the term for a three-nucleotide sequence that codes for an amino acid?
A
base
B
codon
C
amine
D
serine
Explanation: 

Detailed explanation-1: -A codon is a DNA or RNA sequence of three nucleotides (a trinucleotide) that forms a unit of genomic information encoding a particular amino acid or signaling the termination of protein synthesis (stop signals).

Detailed explanation-2: -The wobble position of a codon refers to the 3rd nucleotide in a codon. This nucleotide has two major characteristics: Binding of a codon in an mRNA the cognate tRNA is much “looser” in the third position of the codon. This permits several types of non-Watson–Crick base pairing to occur at the third codon position.

Detailed explanation-3: -Different codons that encode the same amino acid are known as synonymous codons.

Detailed explanation-4: -This is where codons come in. If we read the RNA in triplets, every unique set of three nucleotides can code for a different amino acid. There are 64 different combinations of triplet nucleotides, which gives more than enough to have one triplet per amino acid.

Detailed explanation-5: -Three adjacent nucleotides constitute a unit known as the codon, which codes for an amino acid.

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