BCD TAllolactose A TActiviator B Repressor BCE A BDO ATP TON CDE Regulatory sequ
ID: 80648 • Letter: B
Question
BCD TAllolactose A TActiviator B Repressor BCE A BDO ATP TON CDE Regulatory sequence E Transcript Region CE Lactose DE Glucose AB Terminator AC operator ABC Energy LASD iaci AD Transcript Region be used more than once ar not at all. #63- 79 nswer ch Gene Regulation The basic anatomy of the gene includes the regulatory sequence, the gene sequence, (63) is where the RNA polymerase binds, the (64) contains the sequences that outlines or codes for protein to be created, and the (65) codes for a sequence that causes the transcription complex to dissociate from the DNA, signaling the end of transcription. Another level of gene regulation can be illustrated by the lac operon. The (66) codes for the repressor, regulated by the ipromoter. The repressor binds to an effector molecule (67) when lactose is present, because the effector molecule is a by product of lactose digestion. If lactose is not present, the effector molecule is not produced, thus the repressor will bind to the (68). When the repressor is bound, RNA polymerase can not transcribe, thus turning the gene illustrated by figure (70). When the cell can not produce ATP due to lack of nutrients, the cell has increased amounts of (71)-the effector molecule for CAP. CAP is an (72) and must bind to the effector molecule in order to bind to the CAP-site CAP bound increases the angle of the DNA which is optimal for RNA polymerase binding, thus increasing transcription. When both CAP is bound to the CAP-site AND the repressor is bound to the effector molecule, the gene is turned (73) for enhanced transcription, illustrated by figure (74). When the cell has effector molecule will be produced, leaving the repressor bound to (76), and there will be insufficient amounts of (77) to bind to CAP. Therefore, the lac operon will be turned (78). This scenario is ideal for theExplanation / Answer
63- promoter
64-transcript region
65- terminator
66- lacI
67-Allolactose
68- operator
69-OFF
70-B
71- cAMP
72- Activator
73- ON
74-A
75-Glucose
76- operator
77- cAMP
78- OFF
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