The fact that some eukaryotic rRNAs are self-splicing indicates that (A RNA can contain modified bases. B RNA structures are highly variable. They can function as ribozyme. D Eukaryotes have multiple RNA polymerases.
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- 49Eukaryotic RNA polymerases can be distinguished by their sensitivities to ( ). 50Each bacterial mRNA open reading frame has its own ( ) codon. 51Two nuclear splicing intermediates resemble ______________. A.helicesb.lariatsc.hairpinsD.projectionsa) What is genetic code and What are the properties of genetic codeb) Explain the role of translation elongation factors of E.coli.Ribosomal RNAs (rRNAs) are another example of a functional RNA molecule. Based on Figure 9-11, what do youthink is the significance of the secondary structure ofrRNA?
- The Lariat Intermediate in RNA Splicing Draw the structures that comprise the lariat branch point formed during mRNA splicing: the invariant A. its 5’-R neighbor, its 3’-Y neighbor, and its 2’-G neighbor.The Second Genetic Code Review the evidence establishing that aminoacyl-tRNA synthetases bridge the information gap between amino acids and codons. Indicate the various levels of specificity possessed by aminoacyl-tRNA synthetases that are essential for high-fidelity translation of messenger RNA molecules.An RNA sequece includes 15 codons. How amny animo acids does this sequence encode?
- What's the tRNA strand for the following mRNA strand: AUGGCUAACCUUGUA19Eukaryotic messenger RNA and hnRNA both have poly (A) tails at their 3'-ends. Yesorno 20Messenger RNA splicing and export are uncoupled processes. Yesorno twenty oneWhich of the following plays an important role in directing newly synthesized proteins to specific cellular destinations?A.signal sequenceb.nuclear localization signalc.chain elongation stretchD.Shine – DalgarnoCompare and contrast the properties and roles of siRNAs and miRNAs in RNA interference. Be sure to describe how these two types of small RNA are generated, what types of mRNAs they target, and what happens to the targeted mRNAs. What aspects of these processes are the same? And what aspects are different?
- What is the phenomenon of RNA interference (RNAi)? DuringRNAi, explain how the double-stranded RNA is processed andhow it leads to the silencing of a complementary mRNA.A portion of an mRNA attached to a ribosome reads: 5′ GACAUGAACAGC 3′ If a tRNA with a methionine amino acid attached is in the P site of the ribosome, a tRNA with which amino acid attached will enter the A site Lysine Asparagine Threonine Glutamic AcidThe eukaryotic mature mRNA sequence will be translated into a polypeptide that is _____ amino acids long (hint remember to "be a ribosome" and scan for the AUG and look out for stop codons!). 5’-CCATTCAUGUUUGGUGGCUAACCA-3’
