A 2-Year-Old Boy Suffers from Recurrent Bacterial Infection of His

question 19

Multiple Choice

A 2-year-old boy suffers from recurrent bacterial infection of his ears,sinuses,lungs,and skin;laboratory studies indicate absence of sialylated Lewis X on his leukocytes.He is diagnosed with leukocyte adhesion deficiency type 2 (LAD-2) .Which type of adhesive interaction required for leukocyte migration is defective in this boy?

• A)E-selectin ligand binding to E-selectin
• B)CD4 binding to class II MHC
• C)VLA-4 binding to VCAM-1
• D)Ig Fc receptor binding to Ig-coated cells
• E)LFA-1 binding to ICAM-1

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Definitions:

O Proposition

A type of categorical proposition that is a statement in the form "Some S are not P," where S is the subject and P is the predicate.

Opposition

A relationship between ideas, forces, or entities characterized by contrast or conflict.

Predicate Term

A component of a logical statement that asserts something about the subject of the statement.

Subject Term

In logic, the term about which something is being declared in a proposition, typically appearing as the subject in the grammatical structure of the statement.