SCI 135 - Second Exam Fall 2019


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. When liver cells build starches, the process used is

_______    a. Dehydration synthesis         b. Carbohydration        c. Polarity matching
                d. Hydrolysis                                        e. Slimy

        2. The active ingredient in the waterproofing ScotchGuard spray is

_______    a. Ionized             b. Hydrophilic            c. Hydrophobic             d. Electronized
                        e. Something that, if you discover it, they’ll send a guy to tape you to death

        3. Three nucleotides that are used to produce one amino acid in a gene -

_______    a. Allele             b. Codon             c. RNA            d. Aminon
                                e. Wait, I’m pretty sure I know this one

        4. Prokaryote chromosomes differ from eukaryote chromosomes in

_______    a. Shape only             b. Number only            c. Shape and number
                d. In no significant way         e. Well, one’s in that group and…no, too obvious

        5. Which usually exist as one to a few molecular ring structures?

_______    a. Sugars             b. Lipids             c. Water            d. Starches
                                e. The Molecule Wrestling Federation

        6. 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

        7. Polar molecules get their polarity from

_____    a. Hydrogen bonds         b. Ionic bonds        c. Multiple bonds         d. Electric bonds
                                                    e. I’m guessing some sort of bonds

        8. The organization of periodic table columns is based upon

_______    a. Protons             b. Neutrons             c. Electrons            d. Molecules
                                                e. Eeeny, meeny, miney, moe...

        9. Eukaryote cells can be found in

_______    a. Multicelled species only
                 b. Single-celled species only

                 c. Both multicelled and single-celled species
                 d. Neither multicelled nor single-celled species
                 e. Am I right that one of these choices makes no sense at all?

        10. Surface tension in water is a product of

_______    a. Ionic bonds             b. Cohesion             c. Adhesion            d. Covalent bonds
                                            e. What makes water tense?

        11. Life in general has protein-driven chemistry. The type of proteins that drive it are

_______    a. Enzymes             b. ATP             c. Hormones            d. Carbohydrates
                                                e. Trained at tiny driving schools

        12. Oxygen and Nitrogen in the air exist as stable molecules (O2 and N2, from
                        Columns 6 and 5, respectively) which have

_______    a. Hydrogen bonds             b. Ionic bonds            c. Multiple bonds
                d. Electric bonds                        e. I’m guessing some sort of bonds, again


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


2. In a cup of coffee (no cream, no sugar), what is the -


3. Give the base sequence for the other strand of DNA -
         A  C  T  C  G  A  T  A  C  T  G  A


4. What are the two basic component molecules of a lipid?


5. What are the two main proteins in muscle?


6. The math-based explanation for maximum cell size works on the ratio between what and what?

7. Briefly explain what a hydration shell is.

8. What feature of many toxins makes them easily absorbed into cells?

9. The laboratory technique called sectioning -

10. What makes something a polymer?

11. What makes a lipid molecule unsaturated?

12. What happens at an enzyme’s active site?

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

14. What “adjustment language” was added later to the Cell Theory?

15. What are two different things found in non-coding DNA that are still some type of code?


16. Column 8 elements are very unreactive chemically. Briefly explain why.

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.  Draw bonds yourself (include some doubles) and practice.
O           O           O

          O              O           O           O
                    O                                       O           O
          O               O

2. Give two different uses for each -



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





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. Explain what happens, on the molecular level, to water as the temperature drops from 15o C to -5o C.

6.  Give four rules from the Cell Theory.



7.  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           _______________                                          _________________

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 radicals that makes them so unstable? Three Points.

Why is the atmosphere almost 75% Nitrogen? Three Points.

Science fiction writers have thought that elements other than carbon might serve as the main atoms in alien living systems - based on what makes carbon work in our systems, where should they look for candidate elements? Three Points.

Pick a single property of water - tell which it is, and for Three Points explain why that property is critical for Life on Earth.

What does the term pH actually stand for? Don’t define it, explain why it’s called “pH.” Three Points.

Some ant alarmones produce two different effects at different strengths. For Two Points Each, what are those effects?

What about a chemical name tells you that it’s an enzyme? Three Points.

Which of our proteins have pretty low specificity? Three Points.

How is resolution measured? There are a couple of ways – Three Points for a valid one.

Why do some microscopes have to have a vacuum inside them? Three Points.


SCI 135 

Michael McDarby


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