SC 135 - Second Exam Spring 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 should be found in eukaryotes but not in prokaryotes?

_______     a. DNA             b. Maximum possible size            c. Chromosomes with 2 ends             d. Loop-shaped chromosomes
                                                        e. But, but...the answer I want isn't here!

                2.  Sectioning is a type of

_______     a. Specimen preparation             b. Chemical reaction            c. Cell division             d. Molecule labeling system
                                                                                e. Auditorium design detail

                3.  Water is most dense at the Celsius temperature of

_______     a. 0o             b. 100o             c. 4o             d. -10o            e. Well, I'm feeling pretty dense - what's the temp in here?

                4.  Which is most likely to be hydrophobic?

_______     a. Small ion             b. Large ion             c. Carbohydrate             d. Lipid             e. Audience for Jaws

                5.  Actin and myosin are

_______     a. Found in DNA             b. Important in water chemistry                c. Found in RNA             d. Muscle proteins
                                                                            e. In the new Dancing with the Stars

                6.  The basic process of respiration always

_______     a. Involves oxygen         b. Moves chemical energy around            c. Produces proteins             d. Does all of the above
                                                                                e. Is better than the alternative

                7.  When a glass is overfilled with water, what's happening to the molecules in the "bump" of water above the rim that sustains the bump?

_______     a. Cohesion             b. Evaporation             c. Adhesion             d. Insulation             e. Bumpilation

                8.  The energy that runs through food chains came into the chain as

_______     a. Sugar             b. Starch             c. Light            d. Enzymes             e. Super-charged foody stuff

                9.  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. An internet poll

                10.  Which of these is chemically organic?

_______     a. H
2O             b. CH           c. CO2            d. CN             e. Manure oxide

                11.  Two chromosomes are homologous because they

_______     a. Are in the same type of cell            b. Are exact copies of each other            c. Carry the same types of genes
                  d. Are bound to the same carbohydrates                         e. Look, I'm not interested in their private lives

                12.  In which are objects likely to look three-dimensional?

_______     a. Scanning microscope         b. High-resolution microscope        c. Low-resolution microscope         d. Transmission microscope
                                                                                                e. Um, Avatar-?


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.  Why would a pathway product require information from more than one gene?


2.  What are two different types of organic molecules that are polymers?


Bonus - give the component types for each above (Optional, and does not count as a selected question).


3.  What happens to the participants in a redox reaction?




4.  What are two clear advantages that light microscopes have over electron microscopes?


5.  What are the two basic components in a lipid molecule?


6.  Briefly give the most popular explanation for why active cells seem to have a maximum allowable size.


7.  What is a hydration shell?


8.  What are two of the "rules" from the Cell Theory?


9.  Plants produce starches for different reasons. Connect each to the stability of the bonds.
10. What two different classes of organic molecules can act as catalysts, speeding up chemical reactions?


11. Describe the basic process of hydrolysis.
12. What types of molecules are named with these endings?
13. Ignore the specifics (don't name the actual molecules) - label with the general terms applied to any chemical reaction -
                      CO2          +      H2O                     light        >         C6H12O6          +        O2

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

14. What happens at the active site of an enzyme?



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.  What are four different types of proteins that are involved in some form of communication?




2.  For the pH scale shown below, fill in the proper blanks -
           2   3   4   5   6   7   8   9   10   11   12   13

Name      _________________ ________________ ____________________

Ion                _______________                              ____________________

3.  Using the numbers of bonds as a guide, fill in the symbols for either Carbon, Hydrogen, Nitrogen, or Oxygen.
This would be boxes (the atoms / where the symbols go) connected by lines (the bonds), as shown in class.
4.  Give the name and a description of the three types of chemical bonds:






5.  Pick any two - define the terms.
6.  Name and give a description of the four levels of protein structure.








7.  What are three different biological uses for lipids?  





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 do our local lakes "turn over" late in the year? Three Points.

What often happens to allow certain toxins to accumulate in the body? Three Points.

What is a synapse? Three Points.

What is an antigen? Three Points.

What sort of NON-organic materials often are used commercially as catalysts? Three Points.

Which kind of molecule has had many new types and unsuspected functions discovered in recent years? Three Points.

Where did the name "Junk DNA" come from? Three Points.

When microscopes were being developed, what problem with the lenses had to be solved? Three Points.

Why do light microscopes have a fairly low resolution limit? Three Points.

Most prokaryotes can be referred to accurately with what well-known term? Three Points.



Michael McDarby.

SC 135

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