The questions below refer to the following terms. Each term may be more than onc

Question

The questions below refer to the following terms. Each term may be more than once, or all. Enhancer Promoter Activator Repressor Terminator Can inhibit transcription by blocking the binding of positively activing transcription factors to the DNA. Site in the DNA that may be located far from that transcription initiation site in any direction. The phenomenon in which RNA molecules in a cell arc destroyed if they have a sequence complementary to an introduced double-stranded RNA is called. RNA interference RNA obstruction RNA blocking RNA targeting RNA disposal In eukaryotes, why are certain genes expressed only in certain types of cells? Different cell types contain different genes Different cell types have same genes but different promoters Different cell types have same genes but different enhancers Different cell types have different regulatory transcription factors. The following is/are way(s) of controlling the efficiency of translation. Binding of repressor molecule to the mRNA Binding of small molecules to the mRNA Binding of anti-sense RNA to the mRNA Formation of polyribosome All of the above The following is an example of posttranslational of gene expression Control of transcription by repressor Control of transcription by an inducer Alternative splicing of RNA Controlling transport of mRNA from the nucleus Phosphory lation of protein A mutation can best be described as a: Change in cell morphology Change in number of the nucleus Transient change in DNA Permanent and inheritable change in DNA Change in protein conformation

Explanation / Answer

Q12. Repressor

Q13. Enhancer

Q14. A. RNA interference

Q15. d) Different cells have different regulatory transcription factors. This is called as cellular differentiation. Different cells are destined to express only selected genes, so rest of the genes are silenced. These selcted genes are expressed by different regulatory transcription factors.

Q16. e> All of the above

Q17. e) Phosphorylation of proteins. This is done post-translational.

Q18. d) Permanent and inheritable change in DNA. Heritability is a hallmark of mutation.

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