Practice Questions

TLS Online TPP Program

#Question id: 4947

The first genes on Earth were probably

#XL - S Microbiology

DNA produced by reverse transcriptase from abiotically produced RNA.
DNA molecules whose information was transcribed to RNA and later translated in polypeptides.
auto-catalytic RNA molecules.
RNA produced by autocatalytic, proteinaceous enzymes.

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TLS Online TPP Program

#Question id: 15488

#XL - S Microbiology

IMP biosynthetic genes constitute the pur operon and are involved in Purines synthesis. Bacterial strain used for this

TLS Online TPP Program

#Question id: 15489

#XL - S Microbiology

Glyphosate resistance, Aromatic amino acid are all produced by targeting which pathway

TLS Online TPP Program

#Question id: 15519

#XL - S Microbiology

Double-negative selection perform in between cortex to medulla movements in four stages DN1-DN4 based on the presence or absence of other cell surface molecules, In presence of which genotype cell loses the fate of other lymphoid cell?

TLS Online TPP Program

#Question id: 15520

#XL - S Microbiology

Double-negative (DN) thymocytes that have successfully rearranged their TCRβ chains are valuable, and are identified and expanded via a process known as

TLS Online TPP Program

#Question id: 15521

#XL - S Microbiology

Rearrangement of the β, γ, and δ loci begins during the

TLS Online TPP Program

#Question id: 15524

#XL - S Microbiology

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