6.6 Cell Speciazlization and Gene Expression

• Negative regulatory molecules


  • Inhibit gene expression by binding to DNA and blocking transcription
• Phenotypic differences in cells and organisms

  • Due to the combination of genes that are expressed
• Gene expression differences account for phenotypic differences between organisms
• Interaction of promoters and transcription factors

  • Determine phenotypic differences between tissues within an organism or between individual organisms
• Small RNA molecules

  • Regulate gene expression post-transcription by either blocking transcription or by breaking down messenger RNA
• Promoters are sequences upstream of the transcription start site where RNA polymerase and transcription factors bind to initiate transcription
• Eye tissue cells contain regulatory proteins that interact with transcription factors to initiate transcription
• Interaction of promoters and other transcription factors helps determine phenotypic differences between tissues within an organism or between individual organisms
• Phenotypic differences in cells and organisms are due to the combination of genes that are expressed
• Negative regulatory molecules inhibit gene expression by binding to DNA and blocking transcription
• Small RNA molecules regulate gene expression post-transcription by either blocking transcription or by breaking down messenger RNA