Biology 210A – Sample/Practice Quiz (Chapters 1 – 4) Miramar College Dr. Hurley The following is meant to provide a familiarity with the general format and style/types of questions you may see on the actual quiz. Multiple Choice (2 points each):

1. Discovery science uses ______reasoning while hypothesis-based science uses ______reasoning: A) socratic, aristotilian C) deductive, inductive B) fact-based, hypothetical D) inductive, deductive

2. A scientific prediction or possible explanation for an observed phenomenon is known as a(n): A) Theory C) Fact B) Hypothesis D) None of the Above

3. Which of the following is an ionic compound? – A) Cl C) Cl2 B) CCl4 D) KCl

4. The number of electrons in an atom (non-ion) is equal to the number of: A) protons C) neutron B) A and C D) None of the above

31 5. In the chemical symbol, 15P, the number 15 represents what? A) atomic mass C) electrons in valence shell B) atomic number D) mass number

6. Atoms with the same number of protons, but different number of neutrons are: A) radioactive C) from different elements B) unnatural D) isotopes

7. The first electron shell has ___ orbital(s), and the shape(s) is/are: A) 1, dumbbell C) 1, spherical B) 2, dumbbell and spherical D) 2, spherical

8. Identify the anion: A) Na+ C) Na B) Cl – D) Cl

9. What property of the oxygen atom is responsible for imparting a polar characteristic to H2O? A) High electronegativity C) No electronegativity B) Low electronegativity D) Partial postive charge

10. Given that NO2 has a molar mass of 46 grams, how many molecules of NO2 are present in 4.6 grams of the gas? A) 6.02 x 1022 C) 4.6 x 1022 B) 6.02 x 1023 D) 4.6 x 1023

11. What is the hydrogen ion (H+) concentration of an aqueous solution in which the pOH = 8.0 ? A) 1 x 108 M C) 1 x 10 –7 M B) 1 x 10 –8 M D) 1 x 10 –6 M

12. Which of the following is hydrophobic? A) KBr C) C6H14 B) C2H5OH D) CH3COOH 13. What characteristic of the carbon atom makes formation of large, complex molecules possible? A) Its tetravalence C) Its strong electronegativity B) Its hexavalence D) Its ability to ionize

Matching – Use the below structures to match the correct functional group to the molecule which possesses it (2 points each):

14. ____ A. Phosphate 15. ____ B. Carboxyl 16. ____ C. Hydroxyl 17. ____ D. Amino 18. ____ E. Ketone 19. ____ F. Sulfhydryl 20. ____ G. Aldehyde

Short Essay – Use the space provided to write your answer; where appropriate, you may choose to draw a diagram or schematic to aid in your explanation (label diagrams/schematics clearly).

21. Why is it unlikely that two neighboring water molecules would be arranged like this? (5 points) H H O O H H

22. Why does an organic molecule like sucrose dissolve in water even though it is not an ionic compound? (Hint: think of what major functional group sugars possess) (5 points)