Determine the correctness of the following statements I. Enhancer sequences are those DNA sequences that are involved in increasing the rate of DNA replication. II. Enhancer sequences work by binding with eukaryotic gene activator factors.
Statement I Analysis: Enhancer Sequences & DNA Replication
Statement I claims that enhancer sequences increase the rate of DNA replication. This is incorrect. Enhancer sequences are regulatory elements in DNA that primarily function to boost the rate of transcription, not DNA replication. DNA replication is a separate process managed by different cellular machinery.
Statement II Analysis: Enhancer Sequences & Gene Activators
Statement II states that enhancer sequences function by binding with eukaryotic gene activator factors. This is correct. Enhancers contain specific binding sites for proteins known as transcription factors, often called gene activators. Binding of these activators to the enhancer allows them to interact with the transcription machinery at the gene's promoter, significantly increasing gene transcription.
Conclusion on Enhancer Sequences
- Statement I is false because enhancers affect transcription, not DNA replication.
- Statement II is true as enhancers bind specific gene activator factors to regulate transcription.
Therefore, only statement II is true.
Important Questions from Regulation of Gene Expression
- Which of the following conditions induce(s) the expression of $ \beta$-galactosidase gene in the lac operon?
Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].
Assertion [a]: In multicellular organisms, cells of different lineages have different gene expression profiles.
Reason [r]: Alternative splicing is the only mechanism to generate protein diversity.- The event(s) that lead(s) to inactivation of tumor suppressor genes in cancer cells is(are)
- Which of the following statement(s) is(are) CORRECT regarding the $lac$ operon in $E. coli$ when grown in the presence of glucose and lactose?
Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]
Assertion: Ab initio gene finding algorithms that predict protein coding genes in eukaryotic genomes are not completely accurate.
Reason: Eukaryotic splice sites are difficult to predict.
