Practice 5: Match the statement ends to the beginnings A Shell
D. Cell wall
B. Provides protection and support for the cell
E. Controls what goes into and out of the cell
C. Cell membrane
1. All cells have a
2. Plant cells have a
3. The cell membrane
4. The cell wall
5. The cell wall's function is similar to, or like a

A-4. the cell wall

D-5. the cell walls function is similar to, or like a

B-2. plant cell have a

E-3. the cell membrane

C-1. all cell have a

the correct answer should be false

{apex}

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!