Question

1. what are cd4 cells?

t - cells that have a cd4 receptor
red blood cells
hiv antigens
b - cells that have a glycoprotein receptor

Explanation:

CD4 cells are a type of T - cell (T - lymphocyte). The CD4 is a glycoprotein receptor on the surface of these T - cells. Red blood cells are involved in oxygen transport and do not have CD4 receptors. HIV antigens are substances that can trigger an immune response related to the HIV virus, not cells. B - cells have B - cell receptors (not CD4 receptors) and are involved in antibody production.

Answer:

T - cells that have a CD4 receptor