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TLS Online TPP Program
#Question id: 11643
#Unit 7. System Physiology – Animal
Rapid changes to skin color in many vertebrates is under the control of ________.
TLS Online TPP Program
#Question id: 5038
#Unit 5. Developmental Biology
The folding of sheets of cells, the migration of cells, and cell death are all mechanisms 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.
TLS Online TPP Program
#Question id: 26430
#Unit 3. Fundamental Processes
If the mismatch is near 5’ then which of the following will degrade strands of DNA in the 3’ → 5’ direction
TLS Online TPP Program
#Question id: 601
#Unit 1. Molecules and their Interaction Relevant to Biology
In a ping-pong reaction which does not occur?