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TLS Online TPP Program
#Question id: 16131
#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.
How many units of ß-galactiosidase would you expect to be expressed from deletion 4 in a gln2– mutant?
TLS Online TPP Program
#Question id: 10707
#Unit 10. Ecological Principles
Based on the intermediate disturbance hypothesis, a community’s species diversity is increased by
TLS Online TPP Program
#Question id: 14836
#Unit 5. Developmental Biology
In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the
a. amount of morphogen that must bind to receptors to activate an intracellular signaling system.
b. concentrations of transcription factors required to activate particular genes.
c. concentration at any point effectively provides positional information.
d. amount of morphogen that must bind to receptors to inactivate an extracellular signaling system.
TLS Online TPP Program
#Question id: 24594
#Unit 2. Cellular Organization
Which of the following is an inhibitor of eukaryotic type I topoisomerases
TLS Online TPP Program
#Question id: 12613
#Unit 10. Ecological Principles
A population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02. Estimate the number of individuals added to (or lost from) population of 1,000 individuals in one year.