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there is some permissible latitude in the pairing of the third base in the codon. this is known as one of the following by points. wobble hypothesis lyon’s hypothesis khorana’s hypothesis watson’s hypothesis

there is some permissible latitude in the pairing of the third base in the codon. this is known as one of the following by points.
  1. wobble hypothesis
  2. lyon’s hypothesis
  3. khorana’s hypothesis
  4. watson’s hypothesis

Grade:12

2 Answers

Gaurav
askIITians Faculty 164 Points
9 years ago
Hello Student
Correct answer is a) Wobble Hypothesis
According to wobble hypothesis only the first two base of the codon have a presise pairing with the bases of anticodon of mRNA while the pairing between the third bases of codon and anticodon may be non specific.
Raheema Javed
156 Points
9 years ago
The correct answer is (1) Wobble hypothesis

The Wobble hypothesis: The triplet code of codon is degenerate i.e., there are many more codons than there are amino acids. Only 20 amino acids are involved in protein synthesis, while there are 64 possibilities or types of codons (43). Hence more than one codon can code for an amino acid.

Regarding tRNA present in cytoplasm, since they have to bind themselves to a specific codon, there should have been as may tRNA's as there are codons: But the number of tRNA is only as many as there are amino acids. This means, the anticodons of tRNA's must be able to 'read' more than one codon of mRNA. How is this reading possible when bonding between base pairs is highly specific?
Crick (1966) proposed' the Wobble hypothesis' in order to solve this appar­ent dilemma. According to this hypothesis, only the first two bases of the codon have a precise pairing with the bases of the anticodon of mRNA, while the pairing between the third bases of codon and anticodon may Wobble (non specific).

The pairing in the third base is ambiguous. Thus a single tRNA can pair (bind) with more than one mRNA codon differing in only the third base. For example the anticodon ICG of tRNA can read codons AGC and AGU of mRNA.

The pairing between the first two bases is normal, while between G and U is against the normal pairing pattern. This unusual bonding between G and U is called Wobble pairing.

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