Q.1
The protein composition of a cell is not controlled by,
EXPLANATION
RNA Processing, MicroRNA (miRNA) Biogenesis, Riboswitches and Post-Transcriptional Translation Control
- Determinants of Cellular Protein Abundance:
- The steady-state concentration and composition of proteins in a cell are controlled by:
- Epigenetic modifications (DNA methylation, histone acetylation) governing chromatin accessibility.
- Trans-acting factors (transcription factors, enhancers, repressors) regulating gene transcription rate.
- Rates of synthesis and degradation of mRNAs (mRNA half-life, translation rate) and proteins (ubiquitin-proteasome pathway).
- Protein Kinases: Catalyze post-translational phosphorylation of serine/threonine/tyrosine residues, altering the enzymatic activity, conformation, or localization of existing proteins, but do NOT directly establish the total protein composition (presence/absence/quantity) of the cell.
- nalysis:
- (protein kinases): Correct.
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