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Questions and Answers
What distinguishes housekeeping genes from facultative genes in terms of expression regulation?
What distinguishes housekeeping genes from facultative genes in terms of expression regulation?
- Housekeeping genes are always active, while facultative genes are only active in response to stimuli. (correct)
- Housekeeping genes have longer introns and exons compared to facultative genes.
- Housekeeping genes have promoter regions with complex regulatory sequences.
- Housekeeping genes are regulated by developmental stages and environmental factors.
Which statement about housekeeping genes is true regarding their transcription levels?
Which statement about housekeeping genes is true regarding their transcription levels?
- They possess complex promoter regions that fluctuate during the cell cycle.
- They primarily function during specific developmental stages.
- Their transcription level remains constant and is not influenced by external factors. (correct)
- Their transcription levels are highly variable based on environmental conditions.
What characteristic of housekeeping genes is reflected in their promoter structure?
What characteristic of housekeeping genes is reflected in their promoter structure?
- They contain TATA boxes and long introns.
- They often include multiple regulatory sequences.
- They have simple promoters that lack TATA boxes. (correct)
- They are typically found in a repressed state.
How do facultative genes respond to environmental factors?
How do facultative genes respond to environmental factors?
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Which aspect of housekeeping genes is accurately described?
Which aspect of housekeeping genes is accurately described?
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Study Notes
Housekeeping Genes
- Genes that are always active in the cell and essential for basic life-sustaining functions
- Have simple promoters, lacking TATA boxes, and shorter introns and exons
- Levels of transcription remain constant, not affected by external factors
- Their products are involved in gene expression, metabolism, structural, surface, and signaling functions
Facultative Genes
- Genes that are only activated in response to specific stimuli or developmental stages
- Their expression is inducible and can be activated by things like the cell cycle or environmental factors
- Promoters often contain CpG islands and more complex regulatory sequences
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