1)Put the following events describing the process of mRNA
degradation by miRNA in sequential order.
| 1 the mRNA is degraded or translation of the mRNA is halted |
| 2 an enzyme, Dicer, cleaves the precursor miRNA in small fragments |
| 3 miRNA binds to the mRNA |
| 4 one strand of the miRNA binds a protein complex, the other strand is degraded |
| 5 a precursor miRNA forms a hairpin loop |
Select one:
3, 2, 4, 5, 1
2, 5, 4, 1, 3
5, 4, 2, 1, 3
2, 5, 4, 3, 1
5, 2, 4, 3, 1
2) Which of the following statements concerning proto-oncogenes
is false?
Select one:
A-They can be converted to oncogenes by mutations induced by
carcinogenic substances.
B-They often code for proteins associated with cell growth.
C-They are often genes that code for proteins involved in cell
division.
D-Many proto-oncogenes are transcription factors.
E-None of the above, all the statements are true.
3)Gene expression in eukaryotic organisms can be controlled by
_____.
Select one:
A)mRNA degradation
B)initiation of transcription
C)protein processing and degradation
D)alternative splicing
E)all of the above
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