Gene Regulation Worksheet
Explore the fundamental principles of gene regulation, including operons, transcription factors, and epigenetic mechanisms, relevant for Grade 9 Biology.
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Gene Regulation
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. Which of the following best describes the purpose of gene regulation?
To ensure all genes are expressed equally at all times.
To control which genes are expressed and when.
To prevent mutations in DNA.
To replicate DNA before cell division.
2. An operon is a functional unit of DNA containing a cluster of genes under the control of a single promoter. In prokaryotes, what is the role of a repressor protein in an operon?
To bind to the promoter and initiate transcription.
To bind to the operator and block transcription.
To synthesize proteins from mRNA.
To remove introns from mRNA.
3. The Lac operon is an example of an operon, meaning it is usually turned off but can be turned on in the presence of lactose.
4. are proteins that bind to DNA and regulate gene expression by promoting or blocking the recruitment of RNA polymerase.
5. Epigenetic modifications, such as DNA methylation and histone acetylation, can affect gene expression without altering the underlying sequence.
6. All cells in a multicellular organism express the same set of genes at all times.
True
False
7. Briefly explain the difference between positive and negative control in gene regulation, providing an example for each.
8. Describe how environmental factors can influence gene expression through epigenetic mechanisms.