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TLS Online TPP Program

#Question id: 1591

Which of the following is not true about helper T cells?

#XL - S Microbiology

  1. They function in cell-mediated and humoral responses.

  2. They recognize polysaccharide fragments presented by class II MHC molecules.

  3. They bear surface CD4 molecules.

  4. They are subject to infection by HIV.

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TLS Online TPP Program

#Question id: 155

#XL - T Zoology

Which amino acids are linked in phenylalanylglycine?
TLS Online TPP Program

#Question id: 156

#XL - T Zoology

What is the N-terminal for the pentapeptide Val-Ile-Glu-Arg-Tyr?
TLS Online TPP Program

#Question id: 158

#XL - T Zoology

At the isoelectric pH of a tetrapeptide:
TLS Online TPP Program

#Question id: 159

#XL - T Zoology

The chirality of an amino acid results from the fact that its alpha carbon:
TLS Online TPP Program

#Question id: 160

#XL - T Zoology

Of the 20 standard amino acids, only ___________ is not optically active.  The reason is that its side chain ___________.
TLS Online TPP Program

#Question id: 161

#XL - T Zoology

Two amino acids of the standard 20 contain sulfur atoms.  They are: