What are ferns? Plant biology and evolution
What are ferns? Ferns growing in a forest When did ferns evolve? The first ferns - the first plants that had leaves - evolved from plants that were more like [...]
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05, 2017
What are cycads? Evolution and Biology
Cycad trees. They look like palm trees but they are very different! At the end of the Carboniferous period, about 300 million years ago, the only kinds of plants on [...]
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05, 2017
Evolution of Cells – Biology
A mutated snake with two heads With all these new molecules like lipids, amino acids, RNA, and protein floating around in the oceans by around four billion years ago, there [...]
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05, 2017
Natural Selection – Evolution and Biology
The feet of a person with six toes on each foot Whenever protons and electrons bump into each other, or atoms bump into each other, or molecules bump into each other, [...]
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05, 2017
Mushrooms, biology and evolution
Mushrooms growing in a field About 600 million years ago, a few eukaryote cells developed into multi-celled creatures. Some of them became animals, and some became plants, and others became [...]
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05, 2017
Yeast cells – Cell biology
A yeast cell Yeast cells are a very common kind of eukaryote cell. They vary in size, but are usually about four thousandths of a millimeter (4 microns) in diameter, too [...]
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05, 2017
What is a vacuole? Parts of a cell – Biology
Vacuoles in an amoeba (a one-celled eukaryote) Vacuoles are little pockets in the cytoplasm of a cell where a cell stores food. You can see them with a good light [...]
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05, 2017
How do eukaryote flagella move cells?
Human sperm cells with flagella (under a microscope): Eukaryote flagella Not the old kind of flagella About two billion years ago, the first eukaryote cells evolved from the earlier prokaryote [...]
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05, 2017
How do cells move around? The flagellum
Bacterium with a flagellum (under a microscope) Cells drift in the current... The simplest cells, developing about four billion years ago, had no way to control their own movement. They [...]
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05, 2017
What is Tay-Sachs disease? Lysosomes and cell biology
Krystie has Tay-Sachs disease Tay-Sachs is a disease where your lysosomes aren't working right. It's a disease you get in your DNA from your parents. Both your mother and your [...]
