2. What would occur if the repressor of an operon were mutated so it could not b
ID: 255458 • Letter: 2
Question
2. What would occur if the repressor of an operon were mutated so it could not bind the operator. 3. Which of the following statements is true about your DNA in one of your brain cells? a. Most of the DNA codes for proteins a. Irreversible binding of the repressor to the promoter. b. Reduced transcription of the operons genes c. Continuous transeription of the operon's genes d. None of the above b. The majority of gemes will be trascribed e. It is the same as the DNA in a liver cell d. Each gene lies adjacent to an enhancer 4. Many cells such as neurons and muscle cells divide very infrequently because they are in of the cell cycle a Gi b. G2 c. GO d. S phaseExplanation / Answer
2) Option 'c' is the correct answer. Continuous transcription of the operon's gene takes place. Mutation in the repressor such that it cannot bind to operator will lead to permanent switching on of operon, meaning the promoter will always be functional which will lead to continuous transcription of genes in the operon.
3) Option 'c' is the correct answer. It is the same as the DNA in a liver cell. All cells in a multicellular organism is derived through mitotic division of the zygote which is formed after fertilization of ova with sperm. Thus, the DNA in all cells of body will be identical irrespective of their location. The difference in function arises due to differential gene expression by which certain genes are active in certain cells while they remain inactive in other cells.
4) option 'c' is the correct answer. G0 phase is the quiscent phase between G1 and S phase. When the cell cycle is inhibited at G1-S checkpoint, it enters the quiscent stage G0 and differentiates to perform specific functions such as neuronal cells or muscle cells. Such cells loose their capacity to divide further because of the inactivation of ceratin genes due to differential gene expression.
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