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TLS Online TPP Program

#Question id: 3623

To carry out a complementation test, which of the following statement is correct?

#Unit 8. Inheritance Biology

  1. If the mutations are allelic then the heterozygous offspring have only mutant alleles and exhibit wild phenotype:

  2. The mutations occur at different loci, the heterozygous offspring inherit a mutant and a wild-type allele each locus

  3. If the mutations are allelic then the heterozygous offspring have only wild type alleles and exhibit a wild phenotype

  4. The mutations occur at different loci, the heterozygous offspring inherit a mutant allele only

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TLS Online TPP Program

#Question id: 12084

#Unit 10. Ecological Principles

In bottom sediments of lakes and streams, organic matter is broken down by heterotrophic microorganisms and ammonia is released. Under aerobic conditions, specialized bacteria convert ammonia to nitrate (nitrification). This nitrate, together with nitrate from other sources, diffuses into the deeper sediments, where it may undergo anaerobic conversion to nitrogen gas (denitrification). These sediments typically contain oligochaete worms that live with their heads buried and their tails waving back and forth in the overlying water. Plastic columns were packed with freshly collected  stream  sediments  and  then  covered  with  layers  of  nitrate enriched  water.  A  similar  set  of  columns  was packed with sediment that had been sterilized and then covered with either nitrate-enriched water or distilled water. Oligochaete  worms  were  collected  and  acclimated  to  20°(C)Following  acclimation,  worms  were  rinsed  in  distilled water and then added to three sediment columns. The columns were incubated in the dark at 20°C and monitored every three days for changes in the concentration of nitrate in the overlying water. Nitrate concentrations in each of the experimental treatments were plotted against time, as shown in the graph below.


The best explanation for the increase in nitrate concentration in one treatment is that
TLS Online TPP Program

#Question id: 12129

#Unit 10. Ecological Principles

Which of the following treatments would most likely create a healthy, biodiverse community out of an impoverished community?
TLS Online TPP Program

#Question id: 16481

#Unit 12. Applied Biology

The evolution of continuous cell lines from primary cultures occurs due to which reason
TLS Online TPP Program

#Question id: 7588

#General Aptitude

Two trains are running on parallel lines in the same direction at speeds of 60 km/h and 35 km/h respectively. The faster train crosses a man in the slower train in 54 second. If the length of the slower train is 4/5th of the faster train, find the length of the slower train.
TLS Online TPP Program

#Question id: 2114

#Unit 2. Cellular Organization

A research team is working on the design of a new drug for the treatment of lung cancer. To be most effective, this drug must specifically enter the cytoplasm of lung cells while not entering the cells of other tissues. Which of the following characteristics would likely enhance the specificity of this drug?