SCI 135 - Second Exam Fall 2017


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. In the lab, replacing the “regular” water with salt solution

_______    a. Raises the concentration of water above the cell’s
                b. Changes the permeability of the cell membrane
                c. Lowers the concentration of water below the cell’s
                d. Changes the permeability of the cell wall
                e. Is a pretty rude thing to do to the leaf

      2. What is measured by looking at tiny gaps between objects?

_______    a. Resolution         b. Clarity         c. Magnification        d. Repulsion         e. Gappiness

        3. On the lab table is a flask with a whitish liquid labeled “STARCH.”  The whitish liquid is a

_______    a. Solvent         b. Solution         c. Solvent        d. Hydration         e. Bad substitute for lunch

        4. To get into a cell, a particle must pass by/through which layers in order:

_______    a. Hydrophobic, hydrophilic, hydrophilic, hydrophobic
                b. Hydrophilic, hydrophobic, hydrophobic, hydrophilic
                c. Hydrophilic, hydrophobic, hydrophilic, hydrophobic
                d. Hydrophobic, hydrophilic, hydrophobic, hydrophilic
                e. That is way too many layers

        5. Two atoms bond because one has a full positive charge and the other has a full negative charge.
                                What kind of bond is it?

_______    a. Covalent         b. Balancing         c. Neutral        d. Ionic         e. Deeply personal

        6. The main reason that plants produce digestible starches is that

_______    a. They supply nutrients to animals                            b. They provide structure to the plant
                c. They will need to be broken down for later use        d. All of the above
                                        e. It’s one of the few fun things plants can do

        7. Hormones could be

_______    a. Lipids or proteins         b. Proteins only        c. Carbohydrates or lipids         d. Carbohydrates only
                                                            e. The cause of all of our misery

        8. Which would be a dehydration synthesis process?

_______    a. Water freezing        b. Amino acids linking together        c. Hormones connecting to receptors
                d. Breakdown of lipids                    e. I sort of recognize the words…but not together…

        9. Which Kingdom(s) do not have cell walls?

_______    a. They all have them         b. Animals only        c. Bacteria and fungi         d. Plants only
                                    e. What’s that Kingdom in Game of Thrones-?

        10. Pure water is most dense at what Celsius temperature?

_______ a. 100o         b. 0o         c. 12o         d. 4o        e. There’s a Celsius temperature?

        11. The pressure in root pressure is produced by

_______    a. Osmosis         b. Photosynthesis         c. Living cells        d. Gravity
                            e. The GPS thingy – no, wait, that’s route pressure

        12. Sectioning is something that is done

_______    a. When molecules break down         b. During evaporation        c. To microscope specimens
                d. Inside eukaryotes                                        e. When oranges grow


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. For each, what ions are most common?

2. What is the basic function of an enzyme?

3.  Given here is one side (strand) of DNA. Starting with this strand, show:
Strand     T  G  C  T  A  C  C  G  T  A  T  T  G  G  C  G  A  G  T  C  A  T  C  G

                                                        Other DNA strand

4. What are two different types of proteins that can be found embedded in a cell membrane?


5. You put the corner of a paper towel into a water spill, and the water moves into the towel. What property of water is in action there?

6. What are two basic types of molecules that are always some sort of polymer?


7. In the term polyunsaturated fat, what does the term polyunsaturated mean?

8. What, technically, is a gene?

9. What process produces simple carbohydrates?

10. An element in the second column of the Periodic Table is almost always found as a +2 ion. Briefly explain why.

11. The two pieces of a lipid molecule, including how many of each piece -


12. What are two things that non-coding DNA is or does?


13. What is the non-mathy explanation for why there seems to be a maximum size limit on cells?

14.  Label the following chemical reaction with the general terms for each part –
      A               +               B                        x           >                       C

   __________          ___________           ______________         _____________

15. Actin and myosin -
Are what kind
of molecules?
Are found

16. What is the basic molecular formula for a simple sugar?


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.  Using the numbers of bonds as a guide, fill in the symbols for either Carbon, Hydrogen, Nitrogen, or Oxygen.
 Can't recreate the original hand drawing.
                 O           O           O

          O              O           O           O
                    O                                       O           O
          O               O

2.  Name and give a brief description for the four levels of protein structure.





3.  What are three different ways that fresh-water organisms deal with osmosis?


4.  Give four rules from the Cell Theory.



5.  Name the two basic types of cells, and give three sets of differences between them:




6. Give the terms for each of the two groups in each microscope category -
Nature of the
Imaging Beam
How the Beam Interacts
with the specimen

7.  What are four different types of proteins involved in communication and/or signaling?



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.

What is it about free oxygen radicals that makes them so reactive? Three Points.

What happens on the atomic level as the temperature goes up? Three Points.

What is the main purpose of stomach acid? (Before you write, it’s not breakdown!) Three Points.

Organic molecules, by definition, should have carbon, hydrogen, and oxygen in them, but the definition leaves out the oxygen. Why? Three Points.

When a cell process requires energy, what molecule usually comes in and supplies it? Three Points.

Why is it useful for a poison to be a lipid? Three Points.

What molecule type, previously thought to have just a couple of roles, is now being found to have a much bigger number of things that it does? Three Points.

Some microscope specimens must be coated with what material? Three Points.

Prokaryotes can all be kind of accurately talked about by what other term? Three Points.

What’s a mosaic? Three Points.


SCI 135 

Michael McDarby


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