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"

Plants Have Senses Fact

Plant senses don’t work the same as human senses, but generally speaking, plants can see, hear, smell, feel, react, and even think.

All Mammals Start as Female Myth

Mammals don’t start as females, they start as a blank slate with XX/XY genetic code, and for the first 5-6 weeks of gestation only the X gene expresses.

Some People are Born Gay Fact

Science suggests people are born in a range of places in the gay and transgender spectrum, with both nature and nurture playing a role in sexuality.

Some Cells Can Live Forever Fact

Some cells appear to be able to live forever in a lab. However the Hayflick limit sets a cap on the number of times a cell can divide.

There are Different Blood Types Fact

There are four general blood types (A, B, AB, and O), each can be Rh ‘+’ or ‘-‘. Blood types differ by antigens on the surface of red blood cells.

Survival of the Fittest, Only the Strong Survive Myth

“Survival of the fittest” means that those who are best adapted to their environment thrive and tend to be favored by evolution due to “natural selection”. It does not mean that “only the most physically strong or mentally strong thrive”.

Humans Have About 86 Billion Neurons Fact

Studies show the average human has about 86 billion neurons and roughly as many glial cells, however the exact number of neurons and glial cells remains unknown.

Light Can Affect Mood Fact

Exposure to light in moderation, especially natural sunlight, can have an uplifting effect on mood, while excessive darkness can have the opposite effect.

Thoughts Can “Rewire” Your Brain Fact

Thoughts and other stimuli can essentially “rewire” our brain, strengthening useful synaptic pathways and weakening less used ones, this is called neuroplasticity (AKA learning and memory).

All Cells In a Human Start as One Cell Fact

All the cells in a human body start as one cell, a fertilized egg containing 1/2 the mothers DNA and 1/2 the fathers. That cell divides many times creating a unique human being.

Humans Have Many Different Types of Cells Fact

The human body has about 37 trillion cells, comprising 200 different types. Each cell has structures responsible for making hundreds of thousands of different proteins from 20 types of amino acids.

We Know How Complex Cells Evolved Fact

Complex cells (eukaryotes) likely evolved from single-celled organisms (prokaryotes) absorbing other prokaryotes, becoming single complex cells over time (endosymbiosis).

Humans Only Use a Small Part of Their Brain Myth

Evidence suggests that humans use virtually every part of their brain on a daily basis. Some areas function more than others at any given time, but every part of the human brain has a function.