Double negative selection do not apply on which type of T-cells?

TLS Online TPP Program

#Question id: 3294

#Unit 11. Evolution and Behavior

Which one of these processes describes bottleneck effect?

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#Question id: 23639

#General Aptitude

There are three pillars X, Y and Z of different heights. There spiders A, B and C start of climb on these pillars simultaneously. In one chance A climbs on X by 5 cm but slips down 1 cm. B climbs on Y 6 cm but slips down 3 cm. C climbs on Z 7 cm but slips down 2 cm. If they each requires 50 chances to reach the top of the pillar, what is the height of the shortest pillar?

TLS Online TPP Program

#Question id: 5036

#Unit 5. Developmental Biology

 The experiments of Spemann and Mangold first defined what feature of amphibian embryos?

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#Question id: 13013

#Unit 10. Ecological Principles

Suppose the number of bird species is determined mainly by the number of vertical strata found in the environment. If so, in which of the following biomes would you find the greatest number of bird species? 

TLS Online TPP Program

#Question id: 23705

#Unit 13. Methods in Biology

Which of the following is used to make complementary DNA (cDNA) from RNA?