Mhc class ii will interact with a tcr and

question 20 options:

a)

cd8 on the surface of cytotoxic t-cells

b)

cd4 on the surface of cytotoxic t-cells

c)

cd4 on the surface of t-cells

d)

cd8 on the surface of t-cells

CD4 on the surface of helper T-cells.

Explanation:

MHC class II ( major histocompatibility complex) molecules are processed from the exogenous source. The presentation of  antigen on cells are important for the adaptive immune response.

MHC class II interact with CD 4 present on the surface of T helper cells. This interaction is important for the generation of an immune response. Helper T cells can release cytokines and can perform phagocytosis.

Thus, the correct answer is option (C).

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.

the answer to your question is tooth decay.