Question
What is the mode of action for ricin?a. inactivation of transcriptionb. inactivation of rRNAc. activation of the apoptosis pathwayd. inactivation of the immune systeme. creation of pores in cell walls
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It acts by inhibiting protein synthesis in cells. Show more…
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Ricin is a typical naturally-occurring toxin consisting of two components: one that facilitates cell entry and one that causes the toxic effect. Its toxic mechanism involves: a blocking of an enzyme involved in RNA transcription b catalytic excision of sections of ribosomal RNA c the formation of RNA adducts d nuclease activity
Which of the following methods is NOT used by eukaryotic cells to regulate the amount of a protein in the cell? a)Tagging proteins with ubiquitin for degradation by the proteasome. b)Terminating transcription with riboswitches. c)Altering DNA molecules through acetylation and methylation. d)Regulating transcription through phosphorylation of the sigma factor.
Which of these mechanisms exerts gene control by suppressing transcription in eukaryotes? A. Acetylation of histone proteins B. Methylation of DNA C. Action of activator proteins
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