Question

Given below are the steps of protein synthesis. Arrange them in. correct sequence and select the correct option.

(j) Codon-anticodon reaction between mRNA and aminoacyl tRNA complex.
(ii) Attachment of mRNA and smaller sub-unit of ribosome.
(iii) Charging or aminoacylation of tRNA.
(iv) Attachment of larger sub unit of ribosome to the mRNA-tRNAMet complex.
(v) Linking of adjacent amino acids.
(vi) Formation of polypeptide chain.

A. (II)→(I)→(III)→(V)→(IV)→(VI)
B. (V)→(II)→(I)→(III)→(IV)→(VI)
C. (III)→(II)→(IV)→(I)→(V)→(VI)
D. (III)→(II)→(I)→(IV)→(V)→(VI)

Answer 1

The sequential steps of protein synthesis include transcription, tRNA binding to mRNA, mRNA leaving the nucleus, the formation and elongation of the polypeptide chain, and the folding of the polypeptide. Ribosomes play a vital role by enabling the interaction between tRNA and mRNA, which is essential for coding amino acids into polypeptides.

Step-by-step explanation:

The sequential steps in protein synthesis follow a specific order which ensures that the genetic code within DNA is converted into a functional protein. The correct sequence of these steps is as follows:

1. Transcription - DNA is used to create a complementary RNA sequence.
2. tRNA binding to mRNA - Transfer RNA molecules bind to the messenger RNA at the ribosome.
3. Ctraveling of mRNA out of the nucleus - The mRNA moves from the nucleus to the ribosome to direct protein synthesis.
4. Polypeptide chain starts to form as mRNA is translated by tRNA and the ribosome.
5. The polypeptide chain continues to grow as amino acids are added.
6. Folding of the polypeptide - The final protein structure is achieved through folding.

The role of ribosomes in protein synthesis is critical. Ribosomes facilitate the translation process by providing a platform for tRNA and mRNA to interact to code amino acids into the growing polypeptide chain. Thus the correct sequence following the originally provided numeration would be B. (V)→(II)→(I)→(III)→(IV)→(VI).