Question

QUESTION 32 The genetic code was deciphered in part by experiments in which synthetic polynucleotides were used as mRNAs to direct protein synthesis in cell-free extracts (in-vitro system). In the test tube, artificial conditions were used that allowed ribosomes to start protein synthesis anywhere on an RNA molecule, without the need of a translation start codon, as required in a living cell. What type(s) of polypeptides would you expect to be synthesized if the polynucleotide 5'- CAUCAUCAUCAUCAUCAUC...-3' were used as templates in such a cell-free extract? a. His-His-His-His-His-His... b. His-Ser-His-Ser-His-Ser... c. Ser-His-Ile-Ser-His-lle... d.lle-Ile-Ile-Ile-Ile-lle... e. Ser-Ser-Ser-Ser-Ser-Ser...

Answer 1

Answer:

a). His-His-His-His-His-His...

Explanation: As there is no need of start codon, CAU codon represents histidine amino acid (His).