SCI 135 - Fourth Exam Spring 2018


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. Oxygen debt happens in

_______   a. Plant cells when there’s no light
                b. Muscle cells that need more oxygen than they can get
                c. Lung cells, in order to move oxygen
                d. Water when oxygen levels drop
                e. Future banks - you won’t want to default on their loans!

        2. Most of the ATP output of aerobic respiration happens in

_______   a. The electron transport chain         b. Glycolysis        c. Krebs cycle         d. Cellulysis
                                                            e. A little ATP machine

        3. The “Snowball Period” changed life on Earth by

_______   a. Bringing in water         b. Concentrating primordial soup        c. Increasing competition
                d. Stopping chemosynthesis                e. Making it all about winter funtime

        4. Modern versions of Darwin’s evolution theories see changes over time in

_______   a. Species features         b. Individual fitness        c. Kingdoms         d. Gene pools
                                e. The level of craziness in the “counter” theories

        5. Vitamins are a type of

_______   a. Mineral         b. Cofactor         c. Coenzyme        d. Carbohydrate         e. Health scam

        6. The Laws of Thermodynamics apply to

_______   a. Nutritional content of food             b. Movement of energy in a food chain
                c. Enzyme efficiency                        d. Photosynthesis in low light
                e. The hotness of your gorgeousity, Baby! (is that appropriate?)

        7. Living things most likely colonized the land from

_______   a. Swamps and forests         b. Beaches and islands        c. Swamps and islands
                d. Tidal pools and shallow fresh water        d. Their waterfront properties

        8. The famous “plant problem” involves

_______   a. Food chains         b. Environmental toxins        c. Beginnings of Life         d. The nature of sunlight
                                    e. They’re going to rise up and choke us in our sleep

        9. Two nutrients plants need, but are not the main input of photosynthesis:

_______   a. Nitrates & Phosphates         b. Water & phosphates        c. Nitrate & carbon dioxide
                d. Water & carbon dioxide                            e. Pizza & beer

        10. In chemosynthesis, the environmental energy type is usually

_______   a. Light         b. Lightning         c. Ultraviolet        d. Heat         e. Red Bull

        11. Reradiation can happen in materials when

_______   a. Electrons jump outward       b. Electrons jump back inward        c. They break down
                d. They combine chemically        e. They don’t like the radiation they got for Christmas

        12. Which works by lowering activation energy?

_______   a. Photosynthesis         b. Respiration        c. Enzymes         d. Entropy
                            e. I’m just lowering expectations for my mark...


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. Show the basic overall process of aerobic respiration. Include all reactants, products, and energy uses.

2. In general, what are coupled in coupled reactions?

3. Show the basic overall process of photosynthesis. Include all reactants, products, and energy uses.

4. Give the normal progression (very generalized) of organism types in a food chain.

5. When ATP is broken down for energy, what are the two products?


6.  What are the two major uses plants have for glucose?


7. RNA might have led to our “modern” cell chemistry because it can do some things like proteins and DNA...
Like proteins,
it can -
Like DNA,
it can -

8. Where, exactly, do nitrogenous wastes come from?

9. A mutation probably combined which two systems in the evolution of photosynthesis?


10. Two different basic functions plants have for carotenoids -


11. What are two rules that Hardy-Weinberg applies to an allele that keep it around in a population?


12. What are two different possible causes of mass extinctions?


13. What is panspermia?

14. Why, exactly, can a change in pH affect how well enzymes behave?

15. Two features the very first “living systems” had to have:


16. Two features the first “modern” living systems eventually had to have:


Link to Answer Key


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 each step in the theoretical development of Life on Earth, put them in chronological order, from earliest to latest, 1 - 8 in the boxes to the left.









onto Land



2.  Describe (don’t just give a term) four different types of reproductive isolation.



3.  At the points labeled with the stars, attach the appropriate labels from this list:
Violet. X-Ray. InfraRed. Red. Blue. Ultraviolet.
         High Frequency       \           Visible Range          /            Low Frequency        
  *                              *   /   *       *                         *   \   *

4.  What are four different ways that anaerobic organisms impact humans?



5.  For the main photosynthesis reactions:
Exact Materials or Energy Used
Exact Materials Produced

6.  Briefly describe the three different ways that enzyme inhibitors can work.



7.  Answer the questions on the graph for the relationship between enzyme activity and temperature. A. Why is the rate dropping off here?   B. What is this point called?    C. Why is the rate rising here?


                                                                  *                *
                                                              *                        *
Reaction                                      C    *                             *   A
Rate                                                 *                                   * 
                                                       *                                       *
                                                  *                                                    *
                                         *                                                                       *
                          *****                                                                                         ******

                                                                    Temperature ---->



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 would mass extinctions be associated with bottleneck effects? Three Points.

Irreversible enzyme inhibition is often produced by what sorts of secretions? Three Points.

How does the sweetener Splenda relate to the enzyme specificity? Three Points.

When geologists dove to investigate hydrothermal vents, what discovery there took them totally by surprise? Three Points.

What do animals that produce uric acid have in common that connects to that particular feature? Three Points.

What sorts of atoms (which element) are critical in moving electrons around? Three Points.

What type of abnormal cells can go into oxygen debt? Three Points.

What was the first indication that there had been a Snowball Period? Three Points.

Why are brightly-colored fish not brightly colored where they normally live? Three Points.

What color flowers can a typical bee not pick out from the background? Three Points.

What mineral can greatly increase algae growth in the open ocean? Three Points.



SCI 135 

Michael McDarby


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