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.
"e" answers are never the correct answer.

                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
              d. All of the above                                                e. Local officials, after all paperwork has been done

                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 bonds
                                                                            e. Is really willing to commit

                5.  A hydration shell happens

_______ a. Under surface tension             b. Around solute particles            c. On the early, cooling Earth             d. Within lipid droplets
                                                                        e. When you give your turtle Gatorade

                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
              d. Too much is radioactive if it's older                                    e. The other carbons all want someone younger

                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
                                                                        e. Being really, really far north...or south...

                12.  Free radicals are very reactive because their

_______ a. Nuclei are unstable                         b. Outer electron shell is too full                        c. Protons repel their electrons
              d. Outer electron shell isn't full                                            e. Fellow radicals are still imprisoned


Answer any eight of the following questions for 4 Points Each.
if you answer more than eight, only the first eight will be corrected.
You can get partial credit on these answers.

1.  Briefly explain why evaporation is a cooling process.

2.  Give a real-world example of each property of water in action:

3.  What are two different biological uses for lipids?

4.  For the fluid mosaic model, briefly explain -


5.  What is the sequence on the other side of this DNA molecule?

                  C    T    A    G    G    A    T    T    A    G    C    T    C    C    T    A    A    C


6.  Briefly explain how the column on the periodic table indicates what ions the element should form.

7.  Briefly explain what is meant by the term homologous pairs of chromosomes.

8.  Briefly explain what a plasmid is, including where in particular one would be found.

9.  When a nerve impulse crosses a synapse, what two different types of proteins are involved?

10.  What is the basic biological definition of the cellular process of respiration?

11.  What are the functions of the two "ends" of an antibody molecule?

12.  Ignore the specifics - label with the general terms applied to any chemical reaction -

                CO2� �     +                  H2O                     light      >                C6H12O6            +                O2

            ---------------                          ---------------                  -----------------                      ----------------                              -----------------

13.  For cell walls in multi-celled organisms:
What they
are good
What they
14.  Using the modern definition, what makes a molecule "organic"?


Answer any four of the following questions for Eight Points Each.
if you answer more than four, only the first four will be corrected.
You can get partial credit on these answers.

1.  For carbohydrates: Basic formula of

simple carbohydrate: ___________________________

Basic uses of starches
in plants:


Name of basic process
that creates glucose:



2.  Using the numbers of bonds as a guide, fill in the symbols for either Carbon, Hydrogen, Nitrogen, or Oxygen.

These were boxes "connected" by bond lines - symbols go in the box according to the number of bonds for that box.


3.  Microscopes can be split into two main groups based upon either listed feature. For each feature, name the groups.
Nature of the
Imaging Beam


Interaction of Beam
with specimen



4.   Give four rules from the classic Cell Theory.



5.  Name and describe the three basic bond types.



6.  Name and give a description of the four levels of protein structure.

Link to Answer Key


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 Points)?

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.



Michael McDarby.

SC 135

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