Achild who is being evaluated for an immune deficiency fails to make antibody to tetanus toxoid or pneumococcal vaccine, but shows normal cell-mediated immunity as indicated by a positive skin test (swelling and redness) to a commonly encountered environmental antigen. this child has an abnormality of which cell lineage? think in: cellular immunity vs humoral immunity

The answer is B cell lineage. There two stages of B cells Lineage first is the early pro b cell -D and J rearrangement and the late Pro B cell - V-DJ rearrangement. These rearrangements refer to the Heavy chain and activation of KIT causes the B-cell to proliferate.

the man is bald so he has no hair to get wet

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation: