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Area of a sphere – Volume of a sphere

By |2017-07-29T13:10:50+00:00July 29th, 2017|Math|

This is a sphere. A sphere is a three-dimensional circle. Or you could say that a sphere is the set of all the points that are at the same distance from the center of the sphere. In nature, centrifugal force and gravity tend to make a lot of things into spheres: soap bubbles, for instance, atoms, and planets. The radius of a sphere [...]

How do cells get rid of waste? Excretion and cell biology

By |2017-12-26T16:46:37+00:00May 28th, 2017|Biology|

Cell waste: A cell with a vacuole Cell waste and vacuoles Soon after eukaryote cells began to make vacuoles to help them catch their food and store it, about 600 million years ago, the cells also began to use the vacuoles to get rid of garbage in the cell - molecules that the [...]

Vacuoles – Soap bubble project – Cell biology

By |2017-05-28T21:56:21+00:00May 28th, 2017|Biology|

A child blows soap bubbles You can see how the lipid membranes around the cell and around the vacuoles seal themselves off using soap bubbles. Soap bubbles are a kind of lipid membrane. They're not exactly the same as cell membranes, but they're made of fat molecules and they act the same way. [...]

Lipids projects – Oil and Water – Biology and Chemistry Experiments

By |2018-04-16T10:23:03+00:00May 28th, 2017|Biology, Chemistry|

Oil and water You can easily see for yourself how the amino acids, trying to get as far away from the water as possible, formed into little spheres or bubbles. Just take a glass of water and put it on the table. Then slowly pour in some vegetable oil. You'll see that the [...]