Genetic Code

1. Contiguous Reading of Codons on mRNA:
The codon is read on mRNA in a contiguous fashion. This means that the codons are read one after the other in a sequential manner. The codons are read from the 5' end to the 3' end of the mRNA molecule. This is an important feature of the genetic code as it ensures that the correct sequence of amino acids is produced during protein synthesis.

2. Specificity of Codons for Amino Acids:
All 64 codons are specific for amino acids. The genetic code is a set of rules that determines how the sequence of nucleotides in DNA is translated into the sequence of amino acids in a protein. Each codon consists of three nucleotides and codes for a specific amino acid. There are 20 different amino acids, which means that some amino acids are coded for by more than one codon.

3. Degeneracy of Codons:
UGG is a degenerate codon. Degeneracy refers to the fact that some amino acids are coded for by more than one codon. UGG codes for the amino acid tryptophan, and it is the only codon that codes for this amino acid. However, UGG is also considered to be a degenerate codon because it has the potential to code for the amino acid cysteine in some organisms.

4. Accuracy of mRNA Sequence Prediction:
Due to the degenerate code, prediction of mRNA sequence is still accurate. Although the genetic code is degenerate, it is still highly specific. This means that it is possible to predict the amino acid sequence of a protein based on the nucleotide sequence of the mRNA. The degeneracy of the genetic code allows for some flexibility in the coding of amino acids, but it does not compromise the accuracy of the final protein product.

In conclusion, all four statements are correct w.r.t genetic code. The contiguous reading of codons on mRNA ensures that the correct sequence of amino acids is produced during protein synthesis. All 64 codons are specific for amino acids, but some amino acids are coded for by more than one codon, which is known as degeneracy. UGG is a degenerate codon that codes for the amino acid tryptophan, but it can also code for cysteine in some organisms. Despite the degeneracy of the genetic code, it is still highly specific, and it is possible to predict the amino acid sequence of a protein based on the nucleotide sequence of the mRNA.

2 statements are correct.they are 1&4.
1)code is read in a contiguous manner.
2)only 61 codons code for amino acids out of 64.remaining three are stop codons they are UAG,UAA,UGA.
3)UGG codes for Tryptophan which is only coded by UGG.so it is not degenerate.
4)there are amino acids coded by more than one codon i.e degenerate.so we can't predict the correct sequence on m-Rna