Title: Rubber Egg Diffusion
This lab will illustrate diffusion and osmosis through a semi-permeable membrane. A chicken egg will be used as the model cell, because the yolk is actually a single large cell. The surrounding egg white, or albumin, contains water and several different proteins.
Standard(s): [S1] BIO (9-12) 2: Describe cell processes necessary for achieving homeostasis, including active and passive transport, osmosis, diffusion, exocytosis, and endocytosis.
Title: Drying Dishes
In this Science Update, from Science NetLinks, you'll hear how a quirk of dish drying shows off a fundamental idea behind the chemistry of water. Because of their different compositions, plastic takes a lot longer to dry than glass. Science Updates are audio interviews with scientists and are accompanied by a set of questions as well as links to related Science NetLinks lessons and other related resources.
Standard(s): [S1] AQU (9-12) 2: Relate geological and hydrological phenomena and fluid dynamics to aquatic systems.
Title: Acid Stomach
This Science NetLinks lesson is intended for a high-school introductory chemistry class or health class. The lesson begins with the reading of an article on the history of the development of aspirin. Students then complete a lab that compares the reaction of regular aspirin, buffered aspirin, and enteric aspirin in neutral, acidic, and basic solutions. They then analyze the results of the experiment to gain insight into how this information was used by researchers to solve some of the problems associated with aspirin. To complete the lesson, students must understand acids and bases.
Standard(s): [S1] CHE (9-12) 4: Describe solubility in terms of energy changes associated with the solution process.
Title: Plasmolysis in Elodea Plant Cells
In this Science NetLinks lesson, students microscopically detect the presence of chloroplasts, cell walls and cell membranes of the common aquarium plant, Elodea. Students then determine the effects of different salt solutions on the Elodea plant cell structures.
Standard(s): [S1] BIO (9-12) 4: Describe similarities and differences of cell organelles, using diagrams and tables.
Title: From Cell to DNA
This tool, created by Science NetLinks, features an animation that takes students through a tour of a typical human cell, moving from larger to smaller cell structures. It briefly describes some of these structures and describes how DNA strands are constructed. While this page links to the overview of the tool for grades 9-12, you can access reviews for additional grades and benchmarks using the navigation tools at the top of the overview.
Standard(s): [S1] GEN (9-12) 7: Describe the structure and function of DNA, including replication, translation, and transcription.