AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many codons are needed to specify for five amino acids?
A
3
B
5
C
15
D
30
Explanation: 

Detailed explanation-1: -In 9 groups of codons, the nucleotides at the first two positions are sufficient to specify a unique amino acid, and any nucleotide (abbreviated N) at the third position encodes that same amino acid. These comprise 9 codon “families".

Detailed explanation-2: -Amino acids of a polypeptide A polypeptide of 5 amino acids is analogous to a chain with five links. It has two end amino acids, and three internal links. Breaking our chain into smaller pieces is similar to cutting links of a chain and producing smaller chains.

Detailed explanation-3: -Hence, the correct answer is ‘Two amino acids’.

Detailed explanation-4: –Three nucleotide bases make up a single codon. Each codon represents a single amino acid. Therefore, nine nucleotide bases are required to code for three amino acids. Note: A genetic code chart represents different combinations of the four nucleotide bases.

There is 1 question to complete.