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TLS Online TPP Program

#Question id: 11588

Correct and appropriate signal transduction processes are generally under strong selective pressure and are determined by the properties of the molecules involved, the concentrations of signal and receptor molecules, and the binding affinities between signal and receptor. Therefore, a hormone action is very specific in a species at any one point in time. However, there are examples of very diverse functions of a specific hormone between groups of organisms. For example, thyroxin, which is produced in all vertebrates and many invertebrates, can trigger growth, differentiation, metamorphosis, maturation, reproduction, behavior, temperature tolerance, osmoregulation, or seasonal adaptation depending on the organism in which it is produced. What is the most logical explanation for such different responses triggered by thyroxin in organisms?

#Unit 7. System Physiology – Animal
  1. The concentration of thyroxin varies in different organisms. Invertebrate organisms do not have as much thyroxin as vertebrate organisms.
  2. Thyroxin and its receptor molecules have a different binding affinity in different organisms.
  3. Receptor molecules for thyroxin are located on different tissues in different organisms.
  4. The function of thyroxine in a particular tissue is determined by the genes that are transcribed by the activated thyroxine receptor.
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TLS Online TPP Program

#Question id: 18845

#Unit 13. Methods in Biology

The action of EDTA in EDTA-lysozyme treatment in bacterial DNA extraction is
TLS Online TPP Program

#Question id: 33531

#Unit 2. Cellular Organization

The data obtained during DNA microarray analysis showing wildtype vs. mutant expression of genes under different conditions, represented as
TLS Online TPP Program

#Question id: 1881

#Unit 4. Cell Communication and Cell Signaling

Lol p 1-11 are allergens cloned from:
TLS Online TPP Program

#Question id: 18082

#Unit 8. Inheritance Biology

The interaction of selection and inbreeding in determining the incidence of autosomal recessive diseases. Consider a gene in which recessive mutations occur at a rate of 10-5. Assume a selective disadvantage S of 0.4 in homozygotes for the recessive allele. Now assume that, for thousands of generations, 10% of all children have been products of first-cousin matings (the remaining 90% being products of random matings). Calculate the steady-state value of q. Also calculate the incidence of the disease at steady state. 
TLS Online TPP Program

#Question id: 16780

#Unit 13. Methods in Biology

Find the Median of the following grouped data.