Answer:
1. Helper T cell is one of the T cells that absence results in no immune response.
2. Cytotoxic T cell is also a type of white blood cell that Kills cancer cells and virus infected body cells.
3. Regulatory T cell is a suppressor T cells that slows or stops the immune response.
4. Memory cell is a type of B cell that enables quick and efficient response to secondary exposure to antigen
5. B cell is a cell that forms antibody producing cells
Answer:
about 0.9 mol
Explanation:
there are 22.990 g/mol of Na
20.7/22.99 = 0.900391 mol
about 0.9 mol
Answer: 1. Ions
2. Cation
Explanation:
No explanation; this is basic vocabulary. :)
% by mass = (mass solute/mass solution)*100%
mass of the solute = 54.7 g
mass of the solution = mass solute + mass solvent=54.7+500=554.7 g
% by mass = (54.7/554.7)*100%≈0.0986*100% = 9.86%
