Wednesday, September 2, 2015

Biology Students Discover Why Cells Are Small

Mrs. Sullivan's biology students are practicing the skills of science AND answering the question, "Why Are Cells So Small?"

Students measured cubes of agar, calculated surface area, volume, and the surface area to volume ratio for the solid. They dropped the solid agar into vinegar and recorded the amount of time it took for the vinegar to diffuse into the center of the cube. They knew the diffusion was complete when the cube completely changed color! For homework the students are analyzed their data, calculating central tendency and standard deviation, and graphed the data.

It's a good thing these students know how to use a microscope, because there is good evidence to show that a cell with a large surface area and a small volume has an easy time exchanging materials with its environment. In fact, the cells they will study in class have diameters ranging from 2 micrometers to 200 micrometers. Now that's small!

Emma Kelekoma, Lily Briones-Flynn

Kaitlyn Downer, Isabella Ancharski,
Aspen Wolfgang
Izabella Korsak, Henry Scherer,
Alae Miike