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TLS Online TPP Program

#Question id: 341

 Which force can stabilize a DNA double-helix?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Hydrophobic bases are found in the interior of the helix where each base-pair is stabilized by the same number of hydrogen bonds.

  2. Hydrophilic sugar-phosphate groups are found on the exterior of the helix where they can interact with water.

  3. Non-covalent N-glycosidic bonds can form between nitrogenous bases in opposite strands in the helix.

  4. Covalent base-stacking interactions can occur between adjacent bases within the same strand in the helix.

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TLS Online TPP Program

#Question id: 1832

#Unit 4. Cell Communication and Cell Signaling

Individuals lacking C8 or C9 are more prone to infection with the following type of bacteria:
TLS Online TPP Program

#Question id: 1833

#Unit 4. Cell Communication and Cell Signaling

Specific immunity to Mycobacterium tuberculosis in mice can be transferred to naive histocompatible recipients by:
TLS Online TPP Program

#Question id: 1834

#Unit 4. Cell Communication and Cell Signaling

Lepromatous leprosy is characterized by:
TLS Online TPP Program

#Question id: 1835

#Unit 4. Cell Communication and Cell Signaling

The HIV nef protein affects antigen presentation by:
TLS Online TPP Program

#Question id: 1836

#Unit 4. Cell Communication and Cell Signaling

What is the feature that best uniquely describes NK cell activity against a virus-infected cell?
TLS Online TPP Program

#Question id: 1837

#Unit 4. Cell Communication and Cell Signaling

What is the single best answer to the question “Which method is most characteristically used by trypanosomes to escape the immune response?”