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The Following statements describe some o...

The Following statements describe some of the steps of translation ,br (a)For chain elongation, the presence of catalyst enhances the rate of peptide bond formation.br (b) The process of translation of mRNA to protein begins when both the subunits of ribosome encounter and associate with mRNA.br (c) During chain elongation, the ribosomes moves from codon to codon along the mRNA. The correct statements are

A

(a) and (b)

B

(b) and (c)

C

(a) and (c)

D

(a). (b) and (c)

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about translation are correct, let's analyze each statement step by step. ### Step 1: Analyze Statement A **Statement A:** "For chain elongation, the presence of catalyst enhances the rate of peptide bond formation." - During translation, specifically during the elongation phase, peptide bond formation is catalyzed by an enzyme known as peptidyl transferase. This enzyme is part of the ribosomal RNA (rRNA) in the large subunit of the ribosome. - Since peptidyl transferase acts as a catalyst for peptide bond formation, this statement is **correct**. ### Step 2: Analyze Statement B **Statement B:** "The process of translation of mRNA to protein begins when both the subunits of ribosome encounter and associate with mRNA." - Translation begins when the small ribosomal subunit binds to the mRNA. The large subunit then associates with the small subunit after the initiation complex is formed. - Therefore, the statement is misleading because it implies that both subunits must be present at the start of translation, which is not accurate. Thus, this statement is **incorrect**. ### Step 3: Analyze Statement C **Statement C:** "During chain elongation, the ribosomes move from codon to codon along the mRNA." - During the elongation phase of translation, the ribosome indeed moves along the mRNA, reading the codons one by one. This movement is essential for adding amino acids to the growing polypeptide chain. - Therefore, this statement is **correct**. ### Conclusion Based on the analysis: - **Correct Statements:** A and C - **Incorrect Statement:** B ### Final Answer The correct statements are A and C. ---
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The following statements describe the process of translation. I. An amide linkage is formed between adjacent amino acids. II. Hydrogen bonds are formed between the anticodon and the codon. III. mRNA binds to the ribosome. IV. tRNA enters the ribosome carrying a specific amino acid. In which order does this process take place?

Which of these statements about protein synthesis are NOT correct ? I. During transcription, mRNA synthesized from DNA nucleotides to have the same sequence of nucleotides as the DNA strand on which it was made. II. During transcription , tRNA is synthesized from RNA nucleotides and carries codons that are complementary to the sequence of nucleotides on the DNA strand on which it was made. III. During translation, mRNA is synthesized from RNA nucleotides to have the complementary sequence of nucleotides to that. Of the DNA strand on which it was made . IV. During translation ribosomes move on mRNA from '5' and '3' one codon at a time .This is called translocation

Knowledge Check

  • Given below are the steps of protein synthesis. Arrange them in correct sequence and select the correct option. (i) 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-tRNA _("Met") complex. (v) Linking of adjacent amino acids. (vi) Formation of polypeptide chain.

    A
    `(ii)to(i)to(iii)to(v)to(iv)to(vi)`
    B
    `(v)to(ii)to(i)to(iii)to(iv)to(vi)`
    C
    `(iii)to(ii)to(iv)to(i)to(v)to(vi)`
    D
    `(iii)to(ii)to(i)to(iv)to(v)to(vi)`

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    After the addition of the last amino acid to a growing polypeptide chain during the process of protein synthesis, one of the termination codons reaches the appropriate site on the ribosomal surface and then the following envents take place (i) Release of t-RNA molecule from the ribosome. (ii) Dislodging of polypeptide chain from the t-RNA (iii) Dissociation of ribosomes into large and small subunits. ltBrgt The correct sequence of these events:

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