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Science and Chemistry of Biology - Unit 2 Test
True/False
1. _____ Cohesion is the attraction between molecules of the same substance.
2. _____ Adhesion is the attraction between molecules of the same substance.
3. _____ A suspension is a mixture of water and a dissolved material.
4. _____ The word macromolecules means “giant molecules.”
5. _____ Activation energy is the energy needed to get a reaction started.
6. _____ A catalyst is a substance that slows down the rate of a chemical reaction.
7. _____ A enzyme is like a key and the substrate is like a lock.
8. _____ The building blocks of proteins are amino acids.
9. _____ A product is an element or compound that enters into a chemical reaction.
10. _____ A reactant is a element or compound that is produced by a chemical reaction.
11. _____ The center of an atom is called the nucleus.
12. _____ Atoms have equal number of electrons and protons.
13. _____ Water is a polar molecule.
14. _____ pH indicates the concentration of H+ ions in a solution.
15. _____ We use scientific inquiry everyday.
16. _____ During a controlled experiment, two or more variables are changed.
17. _____A dependent variable is measured in response to the independent variable.
18. _____ Carbohydrates are made up of glucose molecules.
19. _____ The word macromolecules means “giant molecules.”
20. _____ A lipid is made up of a nitrogenous base and fatty acid.
21. _____ The building blocks of proteins are amino acids.
Multiple Choice
22. _____ Salt and Pepper physically mixed together is an example of a…
a. Solution
b. Mixture
c. Solute
d. Solvent
23. _____ __________ is a substance in which a solute is dissolved to form a solution.
a. Suspension
b. Solution
c. Solute
d. Solvent
24. _____ The range of the pH scale is…
a. 0-14
b. 5-8
c. 1-8
d. 0-7
25. _____ A compound that forms hydrogen ions (H+) in a solutions is called a…
a. Acid
b. Base
c. PH scale
d. None of the above
26. _____ The basic unit of matter is a (an)…
a. Compound
b. Element
c. Proton
d. Atom
27. ____ Carbon…
a. Makes covalent bonds
b. Allows it to form chains unlimited in length
c. Can be single, double or triple carbon bonds
d. All of the above
28. _____ Macromolecules include…
a. Amino acids, Carbons, Proteins, Nucleic Acids
b. Proteins, Carbohydrates, Nucleic Acids, Lipids
c. Proteins, Carbohydrates, Amino Acids, Lipids
d. Carbohydrates, Nucleic Acids, Protein, Wax
29. _____ Carbohydrates are used as a
a. Enzymes
a. Amino acids
b. Fat to store energy
c. Main source of energy
30. _____ The following is true about lipids except…
a. Lipids are a quick energy source
b. Includes fats, oils and waxes
c. Made mostly from carbon and hydrogen atoms
d. Lipids store energy
31. _____ The following are uses of protein except…
a. Used to form bones and muscles
b. Reproduction of cells
c. Transport substances into or out of the cells
d. Help fight disease
32. _____ Nucleic acids contain all of the following elements except…
a. Iron
b. Oxygen
c. Nitrogen
d. Carbon
33. _____ The following is true about enzymes except…
a. Enzymes are specific to one substrate
b. Enzymes act as biological catalysts
c. Enzymes are not consumed, but help break down foods
d. Enzymes slow down chemical reactions
34. ____ A substance with a PH below 7 is:
a. acidic
b. basic
c. neutral
d. none of these
A. Arm
B. Base
C. Coarse adjustment
D. Diaphragm
E. Diaphragm lever
AB. Fine adjustment
AC. High power objective
AD. Illuminator or lamp
AE. Inversion
BC. Low power objective
BD. Nosepiece
BE. Occular Lens
CD .Scanning objective
CE. Stage
DE. Stage clips