Answer:
peptide antigens by MHC class II molecules
Explanation:
Helper T cells are activated by peptide antigens by MHC class II molecules. These antigens express on the surface of antigen-presenting cells (APCs). After activation, the T helper cells divide and secrete cytokines to assist the immune response.
Answer:
Green chemistry, or sustainable chemistry, involves creation on the molecular level:
Explanation:
Answer:
1. chemical to light
2. sunlight to chemical
3. wind to mechanical
4. chemical to light and heat
Explanation:
