Question

How many statement are correct about polycistronic m-RNA ?
(A)Codes for more than one polypeptide
(B) Commonly found in eukaryotes
(C) More than one ribosomes may be attached to such m-RNA at the same time
(D)More than one stop codon present
(1) One (2) Two (3) Three Four​

Answer 1

Answer:

The correct statements are (A) , (C) and (D).

Explanation:

• A particular kind of RNA called messenger RNA is required for the synthesis of proteins.
• The genetic information required to produce proteins is carried by mRNA molecules.
• They transport data from the DNA in the nucleus.
• The polycistronic mRNA of prokaryotes specifies several polypeptides.
• Genes in eukaryotic cells are monocistronic, while genes in prokaryotic cells are polycistronic.
• A polysome is a structure that has several ribosomes bound to the same mRNA strand.
• Ribosomes are only alive for a short time.
• A polysome or polyribosome is a chain formed when many ribosomes join with a single mRNA.
• A stop codon is a trinucleotide sequence of three nucleotides found in messenger RNA (mRNA) or DNA that instructs the cell to stop production of proteins.
• Trinucleotide codons come in 64 different varieties: 61 list the amino acids and 3 stop codons ( i.e.,UAA, UAG and UGA).

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