.Activation of a T-lymphocyte upon exposure to a T-dependent bacterial antigen stimulates a strong immune response, during which large quantities of bacterial-specific antibodies are produced. The T-helper does not, however, possess the ability to synthesize these antibodies. How can you explain this phenomenon

T helper cells don't synthesize antibodies

Explanation:

Helper T cells are one of the most important types of cells during adaptive (acquired) immune responses. These cells activate B lymphocytes that secrete antibodies and macrophages that kill pathogenic organisms. Moreover, helper T cells also activate cytotoxic T cells that secrete molecules in order to destroy infected cells. However, antibodies that recognize and bind to specific antigenic determinants are only produced by B lymphocytes, thereby antibody production is a function that escapes from T helper cell-mediated responses.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.