What does na+ represent? select all that apply. a positively charged sodium ion a sodium ion that has lost an electron a negatively charge sodium ion a sodium ion that has gained an electron a neutral sodium atom

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

Photosynthesis converts solar energy into what type of energy?

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.