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#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: 10950
#Unit 7. System Physiology – Animal
Presentation of antigen on MHC-I by a cell will result in
TLS Online TPP Program
#Question id: 26904
#Unit 10. Ecological Principles
Ecologist has proposed following explanation to lead biodiversity at tropic.
a.Higher productivity in the tropics allows for more species
b) Environments are more stable and predictable in the tropics, with fairly constant temperatures and rainfall levels year-round
c) Predators and pathogens limit competition in the tropics, which allows more species to coexist
d) High evolutionary speed at tropic than temperate
TLS Online TPP Program
#Question id: 18222
#Unit 9. Diversity of Life Forms
Which event during the evolution of land plants probably made the synthesis of secondary compounds most beneficial?
TLS Online TPP Program
#Question id: 33378
#Unit 1. Molecules and their Interaction Relevant to Biology
The α helices have rotation of