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18. The phenomenon in which RNA molecules in a cell are destroyed if they have a sequence complementary to an introduced double-stranded RNA is called A) RNA interference B) RNA obstruction C) RNA blocking D) RNA targeting E) RNA disposal. 19. cDKs form complex with to control the progression of cell cycle. A) Histone acetyl transferase B) Histone methyltransferase C) Cyclins D) Transcription factors 20. Ethidium bromide causes mutation by: A) Inserting itself between paired bases B) competing with natural bases C) removing amino groups from bases D) causing strand break E) forming thymine dimers 21. A Base analog causes mutation by: A) inserts between paired bases B) competes with natural bases C) removes amino groups from bases D) cause strand break E) form thymine dimmers 22. Ultraviolet light causes mutation by A) inserts between paired bases B) competes with natural bases C) removes amino groups from bases D) cause strand break E) form thymine dimmers 23. the final outcome of Frameshift mutation results in: alteration of reading frame of entire protein from the point of mutation B) change of a codon to a stop codon C) change of a codon that will cause incorporation of same amino acid D) addition of one or more bases E) deletion of one or more bases