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TLS Online TPP Program

#Question id: 3865

Which of the following statements about E. coli RNA polymerase is false?

#Unit 3. Fundamental Processes

  1. Core enzyme selectively binds promoter regions, but cannot initiate synthesis without a sigma factor.

  2. RNA polymerase holoenzyme has several subunits.

  3. RNA produced by this enzyme will be completely complementary to the DNA template.

  4. The enzyme adds nucleotides to the 3' end of the growing RNA chain.

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TLS Online TPP Program

#Question id: 26867

#Unit 10. Ecological Principles

NET production is related directly to when light does not vary,
TLS Online TPP Program

#Question id: 2215

#Unit 2. Cellular Organization

Which statement describes the mode of action of the ABCB1 transporter (the first eukaryotic ABC transporter to be recognized)?
TLS Online TPP Program

#Question id: 32380

#Unit 2. Cellular Organization

Which of the following protein consists almost entirely of a repeating 35-amino-acid actin-binding motif?
TLS Online TPP Program

#Question id: 11149

#Unit 7. System Physiology – Animal

The Nernst equation specifies the equilibrium potential for a particular ion. This equilibrium potential is a function of ________.
TLS Online TPP Program

#Question id: 16127

#Unit 13. Methods in Biology

You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated  gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.
The GLN1 gene shows a rather complex regulation in response to different amino acids. When either glutamate (glu) or glutamine (gln) is added to the medium, the amount of GS expression diminished and when both glutamate and glutamine are added to the medium GS expression is shut off completely. The effects of different mutants on the response to glu and gln are shown below.
Which of the models from best fits these experimental results? Complete the model for the regulation of GLN1 that includes the effects of glu and gln.