Question

(i) The Codon is read in t RNA in a contaguous fashion. There is no punctuatuins. (ii) Some amino acids are coded by more than one codon. (iii) UUU would code for phenylalanine. (iv) GAA is a stop terminator codon. Comparing the above statements (i-iv) select the current option marked with T (True) & F (False) w.r.t. salient features of genetic code.

• A. FTTF
• B. FFTF
• C. TTFF
• D. FTFT
• E. TTTF

Answer 1

Answer: (E)

The correct answer is option (E): TTTF
Nucleic acids and identical three-base codons are used by all known biological systems to regulate the creation of proteins from amino acids. 
The mRNA codon UUU, for instance, codes for phenylalanine in all cells of all animals. The genetic code is hence universal. One codon typically codes for one amino acid. On rare occasions, however, more than one codon may encode the same amino acid, for example, both the codons GAA and GAG encode glutamic acid. This characteristic is known as degeneracy or redundancy. Phenylalanine is coded by the codon UUU. The three STOP codons in the genetic code are UAG, UAA, and UGA. 
These codons are frequently referred to as nonsense codons or termination codons since they do not code for an amino acid. 
These codons designate the conclusion of the polypeptide chain during translation. 
Stop codons indicate the conclusion of this process by binding release factors, forcing the ribosomal subunits to separate and release the amino acid chain. So, GAA is not a stop-terminator codon.