5 Written Questions

1. molecules, usually proteins or nucleic acids, that act as catalysts in biochemical reactions.
2. movement of water within porous spaces due to adhesion, cohesion and surface tension
3. a liquid substance capable of dissolving other substances
4. enzyme and substrate must fit together to fit like puzzle pieces
5. atoms of the same element that have different numbers of neutrons

5 Matching Questions

1. What 4 make up 96% of body mass?
2. atoms
3. chemical equation
4. macromolecules
5. why don't atoms have an electrical charge?

1. a Carbon, hydrogen, oxygen and nitrogen
2. b the smallest unit of matter that has the characteristics of an element; consists of three main types of subatomic particles: protons neutrons and electrons. SOMETIMES CALLED: THE BASIC UNIT OF MATTER
3. c because they have the same number of protons and electrons
4. d a shorthand way to use chemical symbols and numbers to describe a chemical reaction
5. e four main classes of large biological molecules (carbohydrates, lipids, proteins, nucleic acids)

5 Multiple Choice Questions

1. a combination of substances in which each component retains its own properties
   1. lipids
   2. solute
   3. protons
   4. mixture
2. 25
   1. How many naturally occurring elements?
   2. what does water do in the body?
   3. What are elements composed of?
   4. How many elements are essential to the human body
3. the uneven forces acting on the particles on the surface of a liquid; as if a thin film was stretch across the surface
   1. surface tension
   2. adhesion
   3. cohesion
   4. solution
4. an atom or group of atoms that has a positive or negative charge
   1. acids
   2. ion
   3. atoms
   4. bases
5. These have no electrical charge, but add to the mass of the atom
   1. electrons
   2. protons
   3. atoms
   4. neutrons

5 True/False Questions

1. why are charges unevenly distributed in water? → surface tension, cohesion, adhesion, capillary action

   True        False

2. protons → contains carbon, hydrogen, oxygen, and nitrogen. source of energy. needed by tissue for repair and growth. made up of 20 amino acids.

   True        False

3. electrons → negatively charged particles - 3000 times smaller than neutrons and protons

   True        False

4. What is the function of nucleic acids? → lomg-term energy storage, insulation, cell membrane (water barrier)

   True        False

5. proteins → Positively charged particles

   True        False