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TLS Online TPP Program

#Question id: 1739

Cross-linking of B-cell surface receptors:

#XL - Q Biochemistry

  1. Is a characteristic feature of thymus-dependent antigens

  2. Lowers the intracellular Ca2+ concentration

  3. Rapidly phosphorylates the Ig-α and Ig-β chains of the surface Ig receptor

  4. Requires contiguity of two B-cell epitopes of different specificity on the same antigen molecule

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TLS Online TPP Program

#Question id: 950

#XL - P Chemistry

Nitric oxide is formed from arginine. It is a messenger molecule with several functions that include all below except
TLS Online TPP Program

#Question id: 951

#XL - P Chemistry

The changes that occur in cells that lead to its death are called ________.
TLS Online TPP Program

#Question id: 953

#XL - P Chemistry

 The degradation of arginine, histidine and proline all lead to the product ________.
TLS Online TPP Program

#Question id: 959

#XL - P Chemistry

Phenylalanine hydroxylase requires molecular ________ and tetrahydrobiopterin.
TLS Online TPP Program

#Question id: 960

#XL - P Chemistry

Which amino acids are purely ketogenic?
TLS Online TPP Program

#Question id: 962

#XL - P Chemistry

The carbon in urea originates from ________.