Gene Regulation
Biology ⇒ Genetics and Heredity
Gene Regulation starts at 11 and continues till grade 12.
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See sample questions for grade 11
A scientist observes that a gene is highly expressed in liver cells but not in muscle cells. What is the most likely explanation for this observation?
Describe how environmental factors can influence gene regulation.
Describe the difference between inducible and repressible operons.
Describe the role of enhancers in eukaryotic gene regulation.
Describe the role of microRNAs (miRNAs) in gene regulation.
A scientist observes that a gene is highly expressed in liver cells but not in muscle cells. What is the most likely explanation for this observation?
A mutation causes the promoter region of a gene to become less accessible to RNA polymerase. Predict and explain the effect this mutation would have on the expression of the gene.
A researcher finds that a specific gene is transcribed but not translated into protein. Suggest two possible mechanisms of post-transcriptional regulation that could explain this observation.
The lac operon in E. coli is an example of which type of gene regulation?
(1) Inducible
(2) Repressible
(3) Constitutive
(4) Epigenetic
Which of the following best describes a promoter?
(1) A protein that blocks transcription
(2) A DNA sequence where transcription begins
(3) An enzyme that synthesizes RNA
(4) A type of regulatory RNA
Which of the following best describes an operon?
(1) A group of genes regulated together
(2) A single gene with multiple promoters
(3) A protein that binds DNA
(4) A type of RNA polymerase
Which of the following is a difference between prokaryotic and eukaryotic gene regulation?
(1) Only prokaryotes use operons
(2) Only eukaryotes use repressors
(3) Only prokaryotes have promoters
(4) Only eukaryotes use RNA polymerase
Fill in the blank: In eukaryotes, gene expression can be regulated by the modification of __________, such as methylation or acetylation.
Fill in the blank: The addition of a methyl group to cytosine bases in DNA is known as DNA __________.
Fill in the blank: The binding of transcription factors to __________ can either increase or decrease the rate of gene transcription.
Fill in the blank: The DNA sequence that acts as a switch to turn genes on or off in prokaryotes is called the __________.
True or False: All cells in a multicellular organism have the same DNA, but different genes may be expressed in different cell types.
True or False: All genes are regulated at the transcriptional level only.
True or False: All genes in a cell are expressed at all times.
True or False: DNA methylation generally leads to gene silencing.
