Stage thymocytes express neither CD4 nor CD8, markers associated with mature T cells. They are therefore called double negative (DN) cells. DN cells first travel to the region under the thymic capsule, a region referred to as the ________, where they proliferate and begin to generate their T-cell receptors. Thymocytes that successfully express TCRs begin to express both CD4 and CD8, becoming double positive (DP) cells, and populate the cortex, the site where most (85% or more) immature T cells are found.

TLS Online TPP Program

#Question id: 14084

#Unit 1. Molecules and their Interaction Relevant to Biology

In DNA helix the angle at which the two sugars protrude from the base pairs (i.e., the angle between the glycosidic bonds) are 

A. 120

B. 36 

C. 240

D. 20

Choose the correct option?

TLS Online TPP Program

#Question id: 14083

#Unit 1. Molecules and their Interaction Relevant to Biology

What components are required for stabilizing DNA double helix

TLS Online TPP Program

#Question id: 14082

#Unit 1. Molecules and their Interaction Relevant to Biology

Conditions where hoogesteen triple base pairing occurs are

A. Presence of alternate GC repeats

B. Presence of only pyrimidines in a strand

C. Presence of only Purines in a strand

D. Acidic pH

E. Basic pH

Choose the option containing correct statement in it

TLS Online TPP Program

#Question id: 14081

#Unit 1. Molecules and their Interaction Relevant to Biology

pKa of cytosine normally has a value of 4.2 but in hoogsteen triple base pairing this value changes to 

TLS Online TPP Program

#Question id: 14080

#Unit 1. Molecules and their Interaction Relevant to Biology

 Hairpin and cruciform structures are formed when the DNA sequence have

TLS Online TPP Program

#Question id: 14079

#Unit 1. Molecules and their Interaction Relevant to Biology

Which DNA is favored in many solutions that are relatively devoid of water with the base pair per turn of

A. B DNA

B. A DNA

C. Z DNA

D. 10 bp per turn

E. 11 bp per turn

F. 12 bp per turn

Which of the following combination is correct?