B cells have antigen receptors that bind to antigens that are either freely dissolved or present on the surface of invading/foreign cells. T cells have antigen receptors that
A) are active only in lymph nodes.
B) bind only to antigens present on the surface of the invading/foreign cells.
C) bind only to freely dissolved antigens in the plasma.
D) bind to antigens presented on major histocompatability complexes by host cells.
E) bind to antigens that are either freely dissolved or present on the surface of invading/foreign cells.
Opioid receptors
Invasion and metastasis by cancer cells
Contrasting eukaryotic and prokaryotic cells in size and complexity
Over time, cells acquire mutations. Two independently acquired mutations in the same cell may be suf
Cytoplasmic Division in Animal Cells
Cytokinesis in animal cells (a) and plant cells (b)