Map.A. Lehninger Principles of Biochemistry Nelson Cox SEVENTH EDITION MHE/Freem
ID: 268213 • Letter: M
Question
Map.A. Lehninger Principles of Biochemistry Nelson Cox SEVENTH EDITION MHE/Freeman presented by Sapling Learning Transcription of eukaryotic mRNAs can be repressed by either protein repressors (and corepressors) or RNA. Suppose your classmate argues that it should be more energy efficient to have a RNA-based repressor system than a protein-based repressor system. Select statements that could support their argument that the production and maintenance of RNA repressors would use less energy than protein repressors. RNAs with repressor activity are usually smaller than the mRNAs encoding repressor proteins, so less energy is used for transcription of repressors composed of RNA. Degradation occurs for both RNA and protein repressors. However the energy cost of replacement is much less for RNA repressors. Repressor proteins require ATP hydrolysis to drive conformational changes that relieve repression. RNA is more stable than proteins in the cytosol and will not need to be resynthesized as often.Explanation / Answer
answer
first opion is true as usually mirna or sirna re used for repression which are very smller in size