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What are lysosomes? Parts of a cell – Biology

By |2018-04-15T17:01:41+00:00May 28th, 2017|Biology|

Lysosomes (under an electron microscope) Prokaryote cells don't have lysosomes, so the first lysosomes probably evolved about the same time as the other pieces of eukaryote cells. That was about two billion years ago. Like the vacuoles and the Golgi bodies and the other parts of a cell, lysosomes (LIE-sew-somes (like HOMES)) are [...]

What is a Golgi body? Parts of a cell – Biology

By |2017-05-28T23:20:56+00:00May 28th, 2017|Biology|

Taken with an electron microscope at the University of Melbourne, Australia When the RNA of a eukaryote cell has finished assembling new protein or lipid or sugar molecules in the endoplasmic reticulum, the molecules gradually pinch off a little piece of the endoplasmic reticulum around themselves. They seal themselves into a little bubble. [...]

How do cells get rid of waste? Excretion and cell biology

By |2017-12-26T16:46:37+00:00May 28th, 2017|Biology|

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 million years ago, the cells also began to use the vacuoles to get rid of garbage in the cell - molecules that the [...]

What are enzymes? Cell biology

By |2018-04-15T17:01:40+00:00May 28th, 2017|Biology|

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 you from getting sick. An enzyme is a kind of big, complicated protein molecule, made mainly of hydrogen and carbon atoms, but [...]

Cell digestion – Parts of a cell – Cell Biology

By |2017-05-28T16:18:53+00:00May 28th, 2017|Biology|

Amoeba - a one-celled organism All cells have to have some way to get energy from outside themselves, or they will starve to death. The earliest, simplest cells, about 3.5 billion years ago, got their food by drifting around in the ocean until they came to a molecule of protein or another hydrocarbon. Then they let [...]