SCI 135 - Second Exam Fall 2016

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.  A solution with a pH of 10 is

__________  a. Twice as acidic as a pH 9 solution         b. Ten times as acidic as a pH 9 solution
                    c. Twice as basic as a pH 9 solution          d. Ten times as basic as a pH 9 solution
                                        e. Is that a term or a cat spitting?

            2.  Which is most likely to have a stable ion with a +2 charge?

__________  a. Phosphorus, from Column 5                     b. Barium, from Column 2
                    c. Selenium, from Column 7                         d. Krypton, from Column 8
                                e. Is it too late to take basket-weaving instead...?

            3.  In the immune system

_______       a. Antibodies are made to attach to antigens        b. Antibiotics are made to attach to antigens
                    c. Antigens are made to attach to antibodies        d. Antigens are made to attach to antibiotics
                                                    e. Are there any “a” words left?

            4.  During a step in nerve cell function, sodium ions move from inside the cell to where there are
                            more of them just outside the membrane. The process would be

_______       a. Passive transport             b. Facilitated diffusion            c. Active transport
                    d. Neurotransmission                    e. Pretty boring to watch all day

            5.  The most important measure for a microscope is

_______      a. Maximum magnification         b. Resolution        c. Reproducibility         d. Imaging limit
                                                        e. Can I do it on my phone?

            6.  Which is true about polar molecules? It must have...

__________  a. Opposite charges at each end         b. At least one partial charge        c. At least two full charges
                    d. At least one double bond                        e. Heard at least one joke about being cold

            7.  Microtubules, the driving force of flagella movement, are made up of

__________  a. Carbohydrate         b. Lipid         c. Nucleic Acid        d. Protein         e. Little tiny tube-thingies

            8.  Which could probably be found embedded in a cell’s outer membrane?

__________  a. Transfer RNA         b. Pore proteins        c. Microtubules          d. Ribosomes
                                                e. Bugs that hit the windshield

            9.  When molecules are saturated, what are they saturated with?

_______       a. Water         b. Membranes        c. Hydrogen atoms         d. Proteins        e. Sadness. Sadness saturation.

            10. Lactase is used to digest, or break down, molecules of lactose, so it would be

__________  a. A carbohydrate involved in dehydration synthesis
                    b. A protein involved in dehydration synthesis
                    c. A protein involved in hydrolysis
                    d. A carbohydrate involved in hydrolysis
                    e. Asking two things at once? Stop it, just stop it!

             11. The limiting force on root pressure is

_______       a. Gravity         b. Transpiration        c. Diffusion         d. Air pressure
                                e. Roots have pressure? Are their jobs stressful?

            12. Water is most dense at what Celsius temperature?

_______      a. 0o             b. 100 o             c. 4 o             d. 12 o
                    e. …and students are most dense at classroom temperature


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

                                                        Other DNA strand

2.  What purpose is served by microvilli?

3.  Give two sets of differences between the cells of -



4.  Several general classes of important organic molecules are polymers. What are two?


5.  What is a hydration shell?

6.  What are two ways that cilia and flagella are similar?


7.  Lipid molecules are constructed from two basic parts. What are these molecule subunits?


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

   __________                    ___________           ______________                     _____________

9.  What are two Kingdoms where virtually every species has a cell wall?


10. What, technically, is a gene?

11. Give two sets of differences between the chromosomes of -



12. Cell membranes are selectively permeable. What does that mean?

13. What are two general types of proteins that can be considered signalling or communication molecules?


14. In the lab, what is sectioning?

15. Limitations on cell size are connected to the surface-to-volume ratio as cells get larger. Why does a cell need a certain amount of surface for its volume?

16. Non-coding DNA is actually a lot of different things. What are two?


17. What are two different types of uses that organisms get from lipids?



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.
Not reproducible, but count how many bonds are on each box or circle...

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





3.  For carbohydrates -
Process that makes
most of them -
Two main
forms -
Organisms that make
them -

4.  Give four rules from the Cell Theory.


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


6.  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
7.  Give three sets of differences between -




Key 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 almost no ionic bonds in living cells?

People use antioxidants to counteract free radicals. What systems need those radicals to function properly? Three Points each.

Why would plants make starches that are not maximally stable? Three Points

How does the defense behavior of fire ants differ from most other ant species? Three Points.

The protein actin found in an ameba is almost identical to the actin in humans. Why? Three Points.

Cocaine has an effect on what type of proteins? Three Points.

One subtype of molecule used to be thought to have just two versions and uses, but recently so many have been found that they’re hard to name. What’s the subtype? Three Points.

What problem needed to be overcome to get really powerful magnifying lenses? Three Points.

What are dangerous about plasmids? Three Points.

Activating what cell structure transforms “regular” cancer cells into malignant cancers? Three Points.


SCI 135 

Michael McDarby