SC 135 - Second Exam Fall 2010

Links connect to relevant parts of the online book.


On the line to the left, place the letter of the choice that best answers the question.
Three Points Each. NOTE: "e" answers are never the correct answer.

                1.  Which would be necessary to digest a protein?

_______     a. Dehydration synthesis         b. Cohesion        c. Unsaturation         d. Hydrolysis        e. The protein must sign the papers first

                2.  A gene sequence (codon) relates to an amino acid sequence by what ratio?

_______     a. Two to one             b. Three to one             c. One to one            d. Four to one             e. They're no relation


                3.  An atom that is chemically unstable has an issue with its

_______     a. Outer electrons             b. Protons             c. Neutrons            d. Polarity             e. Meds


                4.  A pathway requires multiple genes because it should always

_______     a. Produce multiple proteins            b. Move through multiple cells            c. Require multiple enzymes
                  d. All of these                                                    e. Use a multiplication table

                5.   In photosynthesis, the light energy is

_______     a. Changed into glucose         b. Changed into bond energy        c. Breaks glucose down         d. Not actually used
                                                                            e. Tickling the plants

                6.  Local ponds "turn over" due to

_______     a. Oxygen reactions in the water            b. Carbon dioxide reactions in the water            c. Water density changes
                 d. Effects of plants on the water                                        e. The pillow needs to be flipped

                7.  Alcohol dehydrogenase must be a

_______     a. Type of RNA             b. Protein             c. Carbohydrate            d. Lipid             e. Downer at parties

                8.  Compared to a solution of pH 11, one that's a pH of 13 is

_______     a. 2/11ths more basic             b. 2/13ths more basic            c. 100 times more basic             d. 10 times more basic
                                                e. Different in some unknowable way (well, I don't know it!)

                9.   Which would be one to a few ring molecules with an oxygen "clasp"?

_______     a. Amino acids             b. Lipids             c. Starches            d. Sugars             e. Very weird jewelry

                10.  Hormones could be

_______     a. Lipids or proteins         b. Proteins or carbohydrates        c. Lipids or DNA codes         d. Proteins or DNA codes
                                                                    e. The cause of most of my problems

                11.  Actin and myosin would break down to

_______     a. Nucleotides             b. Sugars             c. Amino acids            d. Fatty acids             e. The right sad music

                12.  When a molecule oxidizes, it

_______     a. Picks up oxygen         b. Loses oxygen        c. Picks up an electron         d. Loses an electron        e. Starts to dress differently


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

1.  Ignore the specifics (don't name the actual molecules) - label with the general terms applied to any chemical reaction -
          C6H12O6   +            O2              enzymes >              CO2          +        H2O

       ---------------       ---------------       -----------------       ----------------       ---------------
2.  Plants produce 2 categories of starches, used different ways - give each use
3.  Why does a basic lipid have THREE fatty acids in it?


4.  What makes a molecule polar?


5.  If most of our DNA is non-coding, why is it there? Give two different things.


6.  Why exactly is carbon dating not usable on things over 50000 years old?


7.  Why would sectioning be necessary? Be fairly specific.


8.  What are two different types of "communication" molecules that can be proteins?


9.  What is a hydration shell?


10. What is the function of each "end" of an antibody molecule?


11. For each category, give an example (NOT a definition!!) of a material that fits it -


12. What two major organic molecule types must be polymers?


13. A microscope's resolution - explain what that means.


14. What are two ways that a DNA molecule is different from an RNA molecule?


15.  What two features make a molecule organic?




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

1.  For three different properties of water:
Property: How produced on molecular level:






2.                   9.01218

                    Column 2
(Radical form)
3.  Give the name and a description of the three types of chemical bonds:






4.  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




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

_____ _____ _____ _____

_____ _____

_____ _____ _____
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 are there only 2 elements on the first row of the Periodic Table? Three Points.

How does radioactivity change what element something is? Three Points.

What is the most common free radical in our cells? Three Points.

Why is such a large fraction of the air we breathe nitrogen? Three Points.

Why is it "useful" for a toxin to be a lipid-based molecule? Three Points.

What two different behaviors are set off by ant alarmones? Two Points Each.

What, technically, does a catalyst do to speed up a reaction? Three Points.

What particular type of molecule is proving to have many different uses, according to the latest research? Three Points.

For some electron microscope work, what do the specimens have to be coated with (Two Points), and why (Three Points)?





Michael McDarby.

SC 135

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