endoplasmic reticulum

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What is RNA? Cell biology and evolution

By |2018-04-16T00:39:56+00:00May 29th, 2017|Biology|

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 "ribonucleic acid". That's a very long, complicated molecule made out of amino acids linked together. The amino acids are made out of atoms of [...]

What is the endoplasmic reticulum? Parts of a cell

By |2017-05-28T22:26:46+00:00May 28th, 2017|Biology|

Endoplasmic reticulum inside a cell The endoplasmic reticulum is made out of a lipid membrane, just like the cell membrane around the outside of a cell, or like vacuoles, or like the membrane around the nucleus of a cell. Probably the endoplasmic reticulum evolved about two billion years ago out of the cell [...]