Using only random VDJ recombination, from 40 V, 23 D, and 6 J gene segments, what are the number of possible variable regions of an antigen receptor molecule?

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#Question id: 15409

#XL - S Microbiology

 A heterozygous trihybrid corn plant is testcrossed and the following progeny are produced (all traits are recessive to their wildtype alternative);

          booster                              6

          booster, silkless                  137       

          booster, liguleless, silkless      291

          liguleless                          142

          liguleless, silkless                  3

          silkless                            30

          booster, liguleless                  34

          wildtype                            339

What is the order of the loci on the chromosome? 

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#Question id: 15446

#XL - S Microbiology

Hyper IgM syndrome caused by mutation in?

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#Question id: 15448

#XL - S Microbiology

Stimulation of a single B cell would result in the generation of a clone of cells having_____

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#Question id: 15449

#XL - S Microbiology

Class switch recombination of B-cell that is generated upon recognition of protein antigens and requires the participation of_____

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#Question id: 15451

#XL - S Microbiology

T-cell dependent, B-cell activation require many signals except___

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#Question id: 15452

#XL - S Microbiology

During  activation of B-cell, T cell delivers cytokines and other signals to its partner B cell. Which types of cytokine signals secreted by T-cells?