The central vacuole in a plant cell is responsible for turgor pressure. when the vacuole loses water the cytoplasm "shrinks". when the vacuole gains water the cytoplasm seems to "puff up". one structure the plant cell keep its shape no matter how much water is in the vacuole. this is the a) cell wall. b) cytoplasm. c) cytoskeleton. d) cell membrane.

The correct answer would be A) cell wall.

In a plant cell, the cell wall is the outermost layer mainly composed of cellulose. It provides protection, support, structure et cetera to the cell.

It provides mechanical support and strength to the cell and regulates the direction of cell growth.

It helps the cell in withstanding the turgor pressure and thus, helps in preventing the bursting of a plant cell in hypotonic solutions. In addition, it also prevents the shrinkage of the cell in hypertonic solutions.

It also protects the cells from invading pathogens such as viruses.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.