15 That TATA box is essential in a) Translation initiation b Transcription initi

Question

15 That TATA box is essential in a) Translation initiation b Transcription initiation in prokaryotes c) Providing a binding site for transcription factors d) Replication initiation 16 fMet is a the first amino acid in all organism b the initiator tRNA c the amino acid that recognizes ATG d brought to the ribosome by (e)IF-2 e) all of the above 17) what enzymat activity is attributable to the ribosome? tic a Aminoacylation b) Translocation c NA addition d transpeptidation 18 small nuclear RNA (snRNA) molecules are known to be involved in which of the following processes in eukaryotes: a splicing out introns from primary RNA transcripts b0 mRNA degradation c) Attach amino acid to uncharged tRNA molecules d) Help correctly position the start codon within the ribosome

Explanation / Answer

15. c. TATA box is a DNA sequence associated with promoter regions in eukaryotic (and archaeic) genes; many transcription factors recognize and bind to it.

16. NONE OF THE OPTIONS IS CORRECT!!!

17. d. Ribosome has peptidyl transferase activity which performs transpeptidation between the growing polypeptide chain and the new amino acid to be added to the polypeptide chain.

18. c. Eukaryotic Initiation Factor 3 binds the small ribosomal subunit of eukaryotes and facilitates the binding of mRNA and other initiation factors to the subunit.

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