As ribosome translocates along an mRNA molecule by codon, which of the following
ID: 269659 • Letter: A
Question
As ribosome translocates along an mRNA molecule by codon, which of the following occurs? The tRNA that was in A site moves into the P site 8) The tRNA that was in A site departs the ribosome C) The tRNA that was in P site moves to E site and is releases D) The tRNA that was in the P site moves into the A site E) Both A and C are correct 27) What is the diameter of a nucleosome? A) 17 nm 8) 15 nm C) 13 nm D) 11 nm E) 15 nm 28) (2) Transcription, (2) Translation, (3) Termination (4) Splicing and Addition of Cap and Poly A (5) Nuclear Export Choose right sequence of events from the choices below: a) 1,2, 3, 4,5 b) 5, 4, 3, 2,1 c) 1,4, 5, 3,2 d) 1,3, 4, 5, 2 29) Chloramphenicol inhibits protein synthesis by A) Blocks binding of aminoacyl-tRNA to A-site of ribosome. B) Blocks initiation of RNA chains. C) Blocks translocation D) Prevents peptidyl transferase reaction on ribosome. E) Prevents binding of mRNA to ribosome 30) Tetracycline inhibits protein synthesis by A) Blocks binding of aminoacyl tRNA to A-site of ribosome. B) Blocks initiation of RNA chains. C) Blocks translocation. D) Prevents peptidyl transferase reaction on ribosome. E) Prevents binding of mRNA to ribosome 31. The 5S rRNA gene is synthesized by a) RNA polymerase I b) RNA polymerase I c) RNA polymerase III d) a) and b)Explanation / Answer
26 - The correct answer is option E that is option A and C both are correct.
Trna moves from A to P for entry of new trna and trna in P site moves from P site to E site to make the peptide bond to the growing polypeptide chain.
27 - The Correct answer is option D that is 11 nm that is the diameter of the nucleosome.
28 - The correct answer is option D that is 1,3,4,5,2.
First the transcription will occur that makes mrna from dna. After that termination of transcription takes place. Immature mrna is spliced from introns and poly A and cap is added. As mrna is matured, it is transported to the cytoplasm, this is called nuclear export. After that translation occur and protein is made from mrna.
29 - The correct answer is option D that is it prevents peptidyl transferase reaction on ribosome as it interacts with 50S subunit and prevent formation of peptide bond.
30 - The correct answer is option A that is it blocks binding of aminoacyl tRNA to A site of ribosome by binding of 30S subunit.
31 - The correct answer is option C that is RNA polymerase III.
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