bio difficult please help me!?
Which molecules in eukaryotic cells regulate gene expression?
a transcription factors
b recombinant DNA
c plasmids
d lactose
What would happen if a chemical interfered with the ability of RNA polymerase to bind to a DNA molecule?
a The DNA molecule would replicate itself.
b Transcription would proceed, and a protein would be produced.
c The RNA polymerase would cut the DNA molecule in half.
d Transcription would not take place, and the protein would not be produced.
4 Responses
siwedlarm
01 Mar 2010
joseph
01 Mar 2010
Which molecules in eukaryotic cells regulate gene expression?
LACTOSE – because it acts as constitutive regulator.
What would happen if a chemical interfered with the ability of RNA polymerase to bind to a DNA molecule?
Transcription would not take place, and the protein would not be produced.
sci219
01 Mar 2010
Hi,
The answer to question one is A.
For question 2, the answer is: D.
Actually I do my research on RNA Polymerase (RNAP). I also deal with the same section on RNAP that your question 2 describes. The region of DNA binding on RNAP is called the sigma region and is coded by the rpoD gene. I am searching for the binding region of the molecule, ppGpp, that results in a decrease in transcription.
good luck.
damuzic21
01 Mar 2010
c the RNA polymerase would cut the DNA molecule in half
"A" (TFs regulate gene expression in many ways one of which is responding to cell signals making them upregulate or downregulate a certain gene. Ex. HSF or Heat Shock Factor is triggered to produce heat shock proteins which protect the conformations of proteins inside the cell during potentially detrimental temperature conditions) and
"D" (RNA pol makes mRNA from DNA and mRNA is used by the ribosome to synthesize polypeptides.)