SC 135 - Second Exam Fall 2009
On the line to the left, place the letter of the choice that
best answers the question. Three Points Each.
1. A microscope's resolution would be determined by
_______ a. How big an image can be made b. How clear a focus you can get c. How many specimens it can process per hour
2. In comparison to a solution with a pH of 9, one that's pH 11 would be
_______ a. 4 times as acidic b. 4 times as basic c. 100 times as acidic d. 100 times as basic e. Two years older
3. The function of a protein is directly related to its
_______ a. Primary structure b. Secondary structure c. Tertiary structure d. DNA structure e. Union membership
4. The presence of double bonds means an organic molecule
_______ a. Is easily ionized b. Will form a ring structure c. Is unsaturated d. Will also have hydrogen
5. A hydration shell happens
_______ a. Under surface tension b. Around solute particles c. On the early, cooling Earth d. Within lipid droplets
6. Carbon dating tends to not work for samples older than 60,000 years because
_______ a. The half-life is 60,000 years b. There was very little radioactive carbon to start c. Radioactive nitrogen confuses the readings
7. Fatty acids lose some of their hydrogen atoms as hydrogen ions, H+. In this reaction, the hydrogen gets
_______ a. Radioactive b. Neutralized c. Reduced d. Oxidized e. Really mad
8. Liver cells absorb sugar and make starch with them through
_______ a. Dehydration synthesis b. Aerobic respiration c. Photosynthesis d. Hydrolysis e. Some complicated chemistry thingy
9. Which must be a polymer?
_______ a. Sucrose b. Sucrase c. Sucranol d. Sucraic acid e. Doesn't it have a choice? Isn't this America?
10. Water is most dense at
_______ a. 0o C b. 1o C c. -100o C d. 4o C e. Exam time
11. Molecules are polar because of
_______ a. Their basic shape b. Distribution of ions c. An external magnetic field d. Unequal sharing of electrons
12. Free radicals are very reactive because their
_______ a. Nuclei are unstable b. Outer electron shell is too full c. Protons repel their electrons
Answer any eight of the following questions for 4 Points Each.
Answer any four of the following questions for Eight Points
Answer as many as you are able. Wrong answers will not result in points being lost from the main exam. You can get partial credit on these answers.
Why is so much of the air around us nitrogen? Three Points.
Sulfur sometimes appears in biological molecules, where it forms "bridges" between
two other atoms. That makes it similar to which more common element in those
molecules (Two Points), because they both are in which periodic table column (Two
Why is it extremely likely that what happens in a neon light is not a chemical
reaction? Three Points.
The "turning over" that lakes do this time of year distributes what important material
throughout the lake? Three Points.
For Two Points each, what sorts of chemicals are thought to be involved in producing
the damage of aging?
What does "pH" probably stand for? Three Points.
What is added to table sugar to make Splenda? Two Points.
And why does that make it largely undigestible? Three Points.
Why do electron microscopes have to have vacuums in them? Three Points.
How can getting an antibiotic for a virus infection lead to the much later development of an antibiotic-resistant bacterial infection? Three Points.