1.MicroRNAs (miRNAs) ____ a. Are post transcriptional regulators b. Are encoded
ID: 96884 • Letter: 1
Question
1.MicroRNAs (miRNAs) ____
a. Are post transcriptional regulators
b. Are encoded by human DNA
c.Form a complex with RISC proteins
d. all of the above.
2.Which statement about the trp operon is FALSE?
a. The structural genes make products that act in a metabolic pathway to produce tryptophan
b. It is normally turned off if tryptophan is present.
c. The operon requires an activator that is regulated by cAMP levels.
d. The operon is under control of a regulatable repressor.
3.Which of the following methods is NOT used by eukaryotic cells to regulate the amount of protein in the cell
a. Binding of repressor proteins to silencer regions on Dna
b.Operons
c.Riboswitches
d. miRNAs
4. which of the following is false
a. cells of the body differ not because they contain different genes but because the express different genes.
b. differentiated cells synthesized and accumulate different genes sets of mrna and protein.
c. gene expression regulation occus only during transcription
d. gene expression regulation is a combinatorial effect of many different regulatory processes.
a. Binding of repressor proteins to silencer regions on Dna
b.Operons
c.Riboswitches
d. miRNAs
4. which of the following is false
a. cells of the body differ not because they contain different genes but because the express different genes.
b. differentiated cells synthesized and accumulate different genes sets of mrna and protein.
c. gene expression regulation occus only during transcription
d. gene expression regulation is a combinatorial effect of many different regulatory processes.
Explanation / Answer
Ans-1 in this option (a) and (c) are right, these are post transcriptional regulators and form completex with RISC protein. But they are found in plant in viruses not in humen.
Ans-2 option (c) is a false statement because there is no activator in trp operon, it only has a repressor but no activator.
Ans-3 option (d) mi RNA is not used by eukaryotic cells.
Ans-4 option (c) is a false statement
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