US National Weather Service Philadelphia September Weather data records that on September 28, 1984, the high temperature did not exceed 52 degrees Fahrenheit, the lowest high measured in Philadelphia in the past 69 years.
Vacuoles are generally used to store cell products or protect the rest of the cell from invading microorganisms. The large central vacuole of plant cells is a special case. It is used to store water and cellular wastes and helps maintain the necessary internal pressure of plants called turgor pressure. Structure.
Cell Structure and Function. 1  The cell wall maintains turgor pressure. The cell wall is porous, but its rigid network of covalent bonds protects the cell from osmotic shock. 2  The gram-positive cell envelope has multiple layers of peptidoglycan, interpenetrated by teichoic acids.