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The peptide-binding groove of MHC class I molecules is composed of the following extracellular domains

Which of the following statements regarding T-cell receptor recognition of antigen is correct?

All of the following are highly polymorphic except

IgG possesses [one] binding sites for antigen, and the T-cell receptor possesses [two] binding sites for antigen

Adrenocortical insufficiency is also referred to as

The nurse is examining an 8 month old infant in the clinic, who was brought in for persistent diaper rash.  The nurse finds perianal inflammation with satellite lesions that cross the inguinal folds.  This most likely is caused by which of the following?

A student studying pediatric hematological disorders learns that anemia can occur in several ways, including which of the following?  Select all that apply.  Write the letter(s) of your choice(s). A. acute or chronic blood loss B. altered shape of RBC’s C. decreased RBC production D. increased RBC production E. increased reticulocyte count

Single-celled prokaryotes

Which level of protein structure do the α helix and the β pleated sheet represent?

The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct statement concerning nitrogen?