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An element is...
any substance that cannot be broken down into simpler substances.
made up of only one kind of atom.
a really good source of protein.
listed by atomic symbol, element name and atomic number in the Periodic Table of Elements.
What 2 elements make up 99% of the air we breathe?
Compounds that contain carbon are called organic
inorganic( organic, inorganic ) compounds.
made of carbon, hydrogen and oxygen.
energy-rich organic compounds.
found in cell walls and cell membranes.
sugars and starches.
made of carbon, hydrogen, oxygen, nitrogen and sometimes sulfur.
made up of smaller molecules called amino acids.
meat, fish, eggs, and nuts.
oils, fats and waxes.
The proteins known as enzymes perform important functions in the chemical reactions that take place in cells. Enzymes speed up chemical reactions in living things.
are made of carbon, oxygen, hydrogen, nitrogen and phosphorus.
contain the instructions that cells need to carry out all the functions of life.
are found in the nucleus of a cell.
RNA( DNA, RNA ) is the genetic material that carries information about an organism and is passed from parent to offspring.
RNA plays an important role in the production of carbohydrates and is found in the cytoplasm as well as the nucleus.