1) 1) A change in a regulatory gene A) is always beneficial to the organism in w
ID: 3166430 • Letter: 1
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1) 1) A change in a regulatory gene A) is always beneficial to the organism in which it occurs. B) is what happens in the production of sickle cell hemoglobin. C) can increase or decrease the expression of a structural gene. D) must be dominant to be effective. 2) 2) What type of regulatory transcription factor binds DNA in order to increases the transcription of a gene? A) a repressor exerting negative control B) a repressor exerting positive control C) an activator exerting positive control D) an activator exerting negative control E) a combination of both a repressor and activator exerting negative control 3) All of these are correct about the lac operon EXCEPT A) It is normally turned off if glucose is present. B) It is an inducible system. C) The structural genes make products that allow lactose metabolism. D) Lactose binds to the repressor protein and inactivates it. E) It regulates the production of a series of five enzymes. 4) A form of gene regulation that occurs while RNA is still in the nucleus is A) rate of binding to ribosomes. B) differential intron removal and exon splicing. C) enzymatic cleavage of a polypeptide. D) feedback control. 5) Which of the following statements about the 5'cap and mRNA processing is TRUE? A) The 5 cap causes the mRNA to be rapidly degraded. B) The 5' cap is added to the pre-mRNA by splicesomes. C) The 5" cap is a group of adenosine molecules. D) The 5' cap prevents the exit of mRNA from the nucleus. E) The addition of a 5' cap to mRNA occurs while the pre-mRNA is being made.Explanation / Answer
Ans 1 : C) Can increase or decrease the expression of a structural gene
The change in regulatory gene can cause upregulation, i.e increase in the expression of gene , or down regulation , i.e. decrease in the expression of the gene. Not every time it can be considered as beneficial , it can be harmful too.
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