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Chapter 2 Biology Test
Basic unit of matter
Protons and neutrons binded together by strong forces
negative charged particle
A pure substance that consists entirely of one atom
Atoms of the same element, that differ in the # of nuetrons
Substance formed by the chemical combination of 2 or more elements in definite proportions.
When electrons are transferred
When electrons are shared
Positive and negative charged atoms
Smallest unit of most compounds
van der waals forces
When molecules are close together and attract
An attraction of molecules of the same substance
An attraction of molecules of different substances
Physically mixed together, but not chemically
mixture of substances where compounds are evenly distributed
Where the solute dissolves in
Mixture of water and non dissolved material
Indicates the concentration of H+ ions
Forms H+ ions
Produces hydroxide ions
weak acids/bases reacts with strong acids/bases
small units that join together to form polymers
Formed by many monomers
Carbohydrates are made of
carbon, hydrogen, and oxygen
Main source of energy and structural purposes
Single sugar molecules
Large macromolecules formed from monosaccharides
Lipids are made of
carbon and hydrogen
Store energy, biological membrane, and waterproof covering
Nucleic acids contain
Hydrogen, oxygen, nitrogen, carbon, and phosphorus
Are nucleotides and store and transmit hereditary, or genetic information.
Nitrogen, carbon, hydrogen, and oxygen
Form bones and muscles, help fight diseases, and regulate cell processes.
Amino group on one end and carboxyl group on the other.
Changes/transforms one set of chemicals into another
Elements or compounds that enter into a chemical reaction
Elements or compounds produced by a chemical reaction
Energy needed to get a reaction started
speeds up a chemical reaction
speeds up chemical reaction in a cell.
Reactants of enzyme-catalyzed reactions
Why is a water molecule polar?
It has an uneven distribution of electrons between the oxygen and hydrogen atoms.
What is a radioactive isotope?
Their nuclei are unstable and break down.