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TLS Online TPP Program

#Question id: 164

The uncommon amino acid selenocysteine has an R group with the structure —CH2—SeH (pKa = 5).  In an aqueous solution, pH = 7.0, selenocysteine would:

#Section 2: General Biology

  1. be a fully ionized zwitterion with -1 net charge

  2. be found in proteins as D-selenocysteine.

  3. never be found in a protein.

  4. be nonionic.

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TLS Online TPP Program

#Question id: 1987

#Section 2: General Biology

A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to
TLS Online TPP Program

#Question id: 1988

#Section 2: General Biology

What are CD4 and CD8?
TLS Online TPP Program

#Question id: 1989

#Section 2: General Biology

Which of the following are T cells of the immune system?
TLS Online TPP Program

#Question id: 1990

#Section 2: General Biology

B cells interacting with helper T cells are stimulated to differentiate when
TLS Online TPP Program

#Question id: 1991

#Section 2: General Biology

Why can normal immune responses be described as polyclonal?
TLS Online TPP Program

#Question id: 1992

#Section 2: General Biology

How do antibodies of the different classes IgM, IgG, IgA, IgD, and IgE differ from each other ?