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. [...]
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. [...]
An onion skin cell (seen through a microscope) You can see the nucleus inside each cell The earliest cells, and all prokaryote cells, don't have a nucleus. Inside these simple [...]
A eukaryote cell (seen through a microscope) full of chloroplasts How do eukaryotes divide? Eukaryote cells generally reproduce themselves using a method called mitosis. When a eukaryote cell senses that there [...]
A mitochondrion (seen through a microscope) When did mitochondria evolve? About two billion years ago, in the Proterozoic, there were only prokaryotic cells on Earth. Mitochondria probably started out as [...]
When did meiosis get started? At first all eukaryote cells divided using a process called mitosis. But about 1.4 billion years ago, some eukaryote cells developed the ability to reproduce using meiosis instead. [...]
Lysosomes (under an electron microscope) When did lysosomes evolve? Prokaryote cells don't have lysosomes, so the first ones probably evolved about the same time as the other pieces of eukaryote [...]
Highly magnified view of a cell wall made of lipids When did the first lipids form? Around four billion years ago, some of the amino acid molecules that were on [...]
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 [...]
Eukaryotes (seen through a microscope) are full of chloroplasts When did eukaryotes evolve? Around two billion years ago, when all cells still lived in the ocean, a few of the [...]
A model of an enzyme reacting with another molecule and breaking it into two pieces. Each little ball represents an atom.This enzyme, lysozyme, breaks up bacteria in your blood to keep [...]