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TLS Online TPP Program

#Question id: 2053

The single best chance of a tissue graft being accepted in a human recipient is if it is:

#Unit 4. Cell Communication and Cell Signaling

  1. An isograft

  2. An allograft given under the cover of potent immunosuppression

  3. A xenograft from a pig in which the gene for α-1,3-galactosyltransferase has been “knocked-out” and therefore the Galα-1,3-Gal epitope eliminated

  4. Given to a recipient that is treated with anti-CD3

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TLS Online TPP Program

#Question id: 251

#Unit 1. Molecules and their Interaction Relevant to Biology

The rise and pitch of B-DNA are 0.33 nm and 3.40 nm, respectively. About how many helical turns are there in a fragment 1 mm in length?
TLS Online TPP Program

#Question id: 252

#Unit 1. Molecules and their Interaction Relevant to Biology

Regions of DNA that are most easily unwound have
TLS Online TPP Program

#Question id: 253

#Unit 1. Molecules and their Interaction Relevant to Biology

Which is not true of the different conformations of DNA?
TLS Online TPP Program

#Question id: 254

#Unit 1. Molecules and their Interaction Relevant to Biology

In addition to knowing the chemical structures of the nucleotides, Watson and Crick used ________ of Franklin and Wilkins and the chemical equivalencies of Chargaff in order to propose their model of DNA structure.
TLS Online TPP Program

#Question id: 255

#Unit 1. Molecules and their Interaction Relevant to Biology

In proteins, amino acids are linked by peptide bonds; in polynucleotides, nucleotides are linked by
TLS Online TPP Program

#Question id: 256

#Unit 1. Molecules and their Interaction Relevant to Biology

The tetranucleotide AGTC (in DNA) has a free hydroxyl group on