Question

complete antibodies are univalent and usually can not directly agglutinate rbcs. true false

Explanation:

Complete antibodies are bivalent (have two antigen - binding sites), not univalent. They can directly agglutinate red blood cells (RBCs) in saline at room temperature or 37°C. In contrast, incomplete antibodies (like some IgG antibodies) are usually univalent and need a special medium (such as albumin or anti - human globulin) to cause agglutination.

Answer:

B. False