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TLS Online TPP Program

#Question id: 1738

T-cell help for antibody production:

#XL - Q Biochemistry

  1. Depends on T-cell recognition of native antigen bound to B-cell surface Ig

  2. Depends on T-cell recognition of antigen processed by the B-cell

  3. Involves class I MHC on the B-cell

  4. Can occur in X-irradiated mice

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TLS Online TPP Program

#Question id: 1539

#XL - S Microbiology

Regulatory T cell (TREG) have identified by the presence of
TLS Online TPP Program

#Question id: 6943

#XL - T Zoology

The portion of the blastoderm-stage embryo which will give rise to most ectodermal, mesodermal, and endodermal tissues is called the:
TLS Online TPP Program

#Question id: 5755

#XL - S Microbiology

A researcher studying bacterial toxin predicts that a lysine within the toxin is important for binding it’s target cell.  She used site-directed mutagenesis to change a codon for lysine (AAA) to one for asparagine (AAU).  However, the mutant toxin still binds to its target cell just as well as the wild-type toxin bound and appears to have no other changes. This type of mutation is probably
TLS Online TPP Program

#Question id: 19934

#XL - P Chemistry

The orbital configuration of 24Cr is 3d54s1. The number of unpaired electrons in is
TLS Online TPP Program

#Question id: 11709

#XL - S Microbiology

Which process results in genetic recombination, but is separate from the process wherein the population size of Paramecium increases?