Which of the following is true about the E. coil lactose operon? a) CAP-CAMP bin

Question

Which of the following is true about the E. coil lactose operon? a) CAP-CAMP binds to beta-galactosidase b) CAP protein by itself binds to the operator c) When CAP-CAMP levels are higher, transcription increases. d) when glucose is absent, CAMP levels decrease. Which of the following is False about RNA gene silencing? a) It may decrease translation. b) The RNA's are over 10,000 bases long. c) It may result in degradation of mRNA. d) A double-stranded RNA may form. Which of the following can cause cancer? a) Normal apoptosis b) Decreased mutation rate c) Underproduction of cyclins. d) Incorrect regulation of transcription factor activity In NORMAL cells, the ras gene family proteins: a) control cell division in response to growth factors b) are active at all time c) are cyclin-dependent kinases d) are transcription factors proper control of the cell cycle invest: a) cyclins b) cyclin dependent kinases c) both of the above The retinoblastoma protein: a) regulates transcription factors b)causes an increases on rate c) in NORMAL cells active throughout the cell cycle

Explanation / Answer

19) As the concentration of the binding molecules increase, the transcription activity increases. so, option C.

20) RNA gene silencing is only 40-50 base pairs long, so Option C is False.

21) Normal apoptosis i.e. normal cell death does not cause cancer. Increase in mutation is responsible for causing cancer, so Option b is incorrect. Cyclins can be responsible for causing cancer, however underproduction of these has no evidence as such. So Option D is correct.

22) Cyclins are the regulatory subunits i.e they help in controlling the cell cycle and Cyclin dependent kinases are catalytic subunits, thus assisting the cell cycle to move forward. So Option C.

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