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60. _A_The genetic code is A. almost universal B. redundant C. ambiguous D. all of the above E. A and B only 61. Which of the
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60.Answer is E. A and B only

Genetic code is a triplet, degenerate, non-overlapping, commaless and almost universal (few examples like mitochondria are exceptional). These are basic properties of genetic code. Genetic code is almost universal, so A is correct. There are 64 codons for 20 amino acids and start and stop singnal. So each amino acid is coded by moerr than 1 codon (triplet), so it is on redundent, hence B is correct. However code is NOT ambiguous.

61. Answer is A. Exons are removed and introns are spliced together IS NOT A STEP in m-RNA processing

Pre-mRNA processing occurs in eukaryotes after transcription. These changes include capping (addition of 7methyl guanine cap at 3 ' end) and tailling (poly A tail 100-250 nucleotides at 5 ' end). Splisosome enzyme compelx (proteins and sn-RNA), removes introns and joins exons. In alternate splicing, m-RNA with different combination of exan is produced.

62. Answer is C. RNA to DNA.

Reverse transcriptase is a enzyme which transcribes RNA in to DNA. Option A- RNA to protein is translation. Option B- DNA to RNA are synthesized by RNA polymerase (transcription). Option D- DNA to DNA is replication of DNA, here DNA polymerase in involved.

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