A cell is the basic biological unit that comprises all living organisms on Earth. Cells contain the DNA that make humans humans and plants plants. There are two basic types of cells that make up all life Eukaryotes and Prokaryotes.
1. Complex Eukaryotic cells make up plants, animals, fungi, slime moulds, protozoa, and algae. They contain their DNA in the nucleus.
2. Simple Prokaryotic cells that lack “organelles” (organelles are essentially a cells organs, like a nucleus for example) and contain their DNA in their cytoplasm. Bacteria and it’s weird cousin archaea are prokaryotic.
Scientists think complex cells (and thus likely all life as we know it) evolved from simple cells merging (with one cell becoming the host and the other the organelle over time) sometime after cells emerged on Earth at least 3.5 billion years ago. This could help explain why scientists just discovered in 2012 a third hybrid type of cell called a Parikaryotic which has aspects of both Eukaryote and Prokaryote.
Factoids tagged with "Cells"
Charles Darwin came up with the idea of natural selection, but he didn’t coin the phrase “survival of the fittest”, that was Herbert Spencer in 1864’s Principles of Sociology.
Flamingos are born with gray feathers. They become pink over time due to their aquatic diet of organisms like shrimp and red algae which are high in pigments called carotenoids.
Studies have shown there is no single determinant of sex, gender, or sexuality. Thus, a binary distinction of “male or female” fails to describe a wide range of humans in practice.
Nettie Stevens and Edmund Beecher Wilson independently discovered the chromosomal XY sex-determination system (that males have XY and females have XX sex chromosomes).
Mirror neurons are neurons that “fire” when observing an action and when performing an action, this allows for learning through imitation (“mirroring”).