What will be the weight in grams of a double-helical DNA molecule stretching from the Earth to the moon (320,000 km). The DNA double helix weighs about 1x10^-18 g/1,000 nucleotide pairs.

TLS Online TPP Program

#Question id: 15519

#Unit 4. Cell Communication and Cell Signaling

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

#Unit 4. Cell Communication and Cell Signaling

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

#Unit 4. Cell Communication and Cell Signaling

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

TLS Online TPP Program

#Question id: 15522

#Unit 4. Cell Communication and Cell Signaling

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

TLS Online TPP Program

#Question id: 15523

#Unit 4. Cell Communication and Cell Signaling

The appearance of ϒδ thymocytes and αβ thymocytes during mouse fetal development. Fetal animals generate

a) more αβ T-cells than ϒδ T-cells

b) the proportion of ϒδ T-cells generated drops off dramatically after birth

c) the proportion of αβ T-cells generated drops off dramatically after birth

d) more ϒδ T-cells than αβ T cells

TLS Online TPP Program

#Question id: 15524

#Unit 4. Cell Communication and Cell Signaling

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