What happened in the Archaean Eon?
Archaean Eon: A volcano erupts out of the water The beginning of the Archaean Eon After the end of the Hadean Eon is the beginning of the Archaean Eon. That's about [...]
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06, 2017
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06, 2017
What is nitrogen? Atoms, Elements, Chemistry
Diagram of a nitrogen atom Inside a red giant star, the star smashes lighter atoms together. Smashing atoms gets the star energy to burn, and also leaves extra heavier atoms. Nitrogen [...]
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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
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 RNA? Cell biology and evolution
RNA molecule: A single strand of RNA, seen under an electron microscope The RNA molecule was probably one of the earliest steps towards life on Earth. RNA is short for [...]
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05, 2017
Cell reproduction – Biology
A cell dividing into two cells The first reproduction One of the main ways we define whether something is alive is whether it can reproduce - if it can make a new [...]
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05, 2017
What is a prokaryote – Cell biology
A prokaryote (seen through a microscope) What does "prokaryote" mean? The simplest living cells are called prokaryotes, which is Greek for "before the nucleus" - these are cells that were [...]
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05, 2017
What is photosynthesis? Plant Biology
Chloroplasts (seen through a microscope) Photosynthesis is the way some cells on Earth pull in light from the sun and use it to make energy to repair and reproduce themselves. [...]
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05, 2017
How did cells evolve? Cell biology and evolution
One cell of a plant (magnified 22,500 times) Thanks to Ohio State University A cell is the smallest living thing (unless you count viruses), and all bigger living things are [...]
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05, 2017
What is DNA? Genetics and Evolution – Biology
A strand of DNA (seen through an electron microscope) Let's start with RNA If the RNA theory of the origin of life is right, then after a short time, about [...]
