The lactose (lac) operon A. functions to break down lactose B. is found in bacte
ID: 166709 • Letter: T
Question
The lactose (lac) operon A. functions to break down lactose B. is found in bacteria C. will be active until lactose is present in the cells D. A and B only are true E. A and C only are true F. B and C only are true G. A, B, and C are all true Cells in the kidney and cells in the heart contain the same genes and yet the cells are very different. This is because A. The RNA polymerase that transcribes them is different B. Different cell specific activators bind to specific "enhancer" sequences on the DNA and allow the transcription initiation complex to assemble C. All cells contain the same "enhancer" sequences and the same activator sequences but they are turned on at different times. D. none of the above explains why kidney and heart cells are different All of the following are true of sexual reproduction EXCEPT: A. daughter cells are identical to parent cells B. there is exchange of genetic information C. it involves fusion of gametes D. offspring come from more than one organism.Explanation / Answer
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Answer 3: Choice G (Lac operon is a catabolic operon in which breakdown of lactose takes place in prokaryotes. The process takes place in the absence of repressor because in that case, the promoter is not bound the repressor and RNA polymerase can freely bring about translation of lactose catabolism genes.)
Answer 4: Choice C (The geonome of all the somatic cells is similar during foetal development but differentiation of cells takes place based upon differential activation of cell-specific genes due to yet differential binding of enhancer proteins on the promoter regions. This brings about transcription and hence translation of different proteins in different cells which make them separate)
Answer 5: Choice A (In sexual reproduction, the daughter cells are not identical to either of the parent cells since there occurs exchange of genetic information between the two parent cells and thus, the daughter cells contains genetic material made from combination of their genotypes)
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