For each of these statements about the genetic code, select True or False. a. T/F Wobble pairing accounts for the redundancy of the genetic code. b. T/F There are 64 different tRNAs that read the 64 possible codons. c. T/F All possible codons are used, but not all codons specify an amino acid. d. T/F Some codons are recognized by proteins, not by tRNAs.

Verified step by step guidance

1. Understand the concept of wobble pairing: Wobble pairing refers to the flexibility in the third base of a codon, allowing some tRNAs to pair with more than one codon. This contributes to the redundancy of the genetic code, where multiple codons can code for the same amino acid.
2. Consider the number of tRNAs: There are fewer than 64 tRNAs because of the wobble hypothesis, which allows some tRNAs to recognize more than one codon.
3. Evaluate the usage of codons: All 64 codons are used in the genetic code, but not all of them specify an amino acid. Some codons serve as stop signals for translation.
4. Identify codons recognized by proteins: Some codons, specifically stop codons, are recognized by release factors (proteins) rather than tRNAs during the termination of protein synthesis.
5. Review each statement based on the above concepts to determine if they are true or false.

Key Concepts

Wobble Pairing

Wobble pairing refers to the flexibility in base pairing between the third position of a codon and the corresponding anticodon of tRNA. This phenomenon allows a single tRNA to recognize multiple codons that code for the same amino acid, contributing to the redundancy of the genetic code. This flexibility helps to minimize the number of tRNA molecules required for protein synthesis.

Codons and tRNAs

Codons are sequences of three nucleotides in mRNA that specify particular amino acids during protein synthesis. There are 64 possible codons, but not all of them correspond to unique tRNAs; in fact, there are fewer than 64 distinct tRNAs due to the wobble effect. This means that some tRNAs can pair with multiple codons, which is essential for efficient translation.

Codon Usage

Codon usage refers to the frequency with which different codons are used to encode amino acids in a given organism. While all 64 codons exist, not all are utilized in every organism, and some codons may not specify an amino acid at all, serving instead as stop signals. Understanding codon usage is crucial for comprehending how genetic information is translated into proteins.