Practice Questions

TLS Online TPP Program

#Question id: 15524

The bulk of DP thymocyte death (~95%) occurs among thymocytes that fail positive selection because

#Unit 4. Cell Communication and Cell Signaling

Their receptors specifically recognize self-MHC molecules with intermediate affinity
Their receptors specifically recognize self-MHC molecules
These cells receive survival signals through their TCRs, and die by a process known as death by neglect.
Their receptors do not specifically recognize self-MHC molecules

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TLS Online TPP Program

#Question id: 3638

#Unit 8. Inheritance Biology

Four different mutant lines showing similar phenotype were identified from a genetic screen. When genetic crosses among these mutants were carried out, the first mutant was found to complement the second, third and fourth mutant lines. However, no other complementation groups do the four mutant lines belongs to?

TLS Online TPP Program

#Question id: 12590

#Unit 10. Ecological Principles

Species introduced to new geographic locations

TLS Online TPP Program

#Question id: 33116

#Unit 1. Molecules and their Interaction Relevant to Biology

Represents

TLS Online TPP Program

#Question id: 11990

#Unit 10. Ecological Principles

Imagine that you are designing an experiment aimed at determining whether the initiation of migratory behavior is largely under genetic control. Of the following options, the best way to proceed is to