BI 171 - Third Exam - 2000

NOTE - the numbers link to related information in the book.  Not all information on old exams is in the new book (so some numbers have no link), and if something looks unfamiliar, you can check to see if it's from a chapter you're supposed to be studying for your current exam.

Multiple Choice.

Place the letter of the choice that best answers the question on the line to the left.
Two Points Each. NOTE: "e" answers are never the correct answer.

_______ 1. Ammonia is a major product of
                        a. Anaerobic respiration                     b. Protein metabolism
                        c. Chemosynthesis                             d. Pyruvate metabolism
                                                e. The cleaning industry

_______ 3. An closed study system would be
                        a. Sealed in energy or matter exchange
                        b. Sealed to energy exchange only
                        c. Sealed to matter exchange only 
                        d. Defined by circumstances
                        e. One you could sell tickets for

_______ 4. Hydrogen atoms are transferred in most
                        a. Oxidation reactions                     b. Membrane pumps
                        c. Osmotic transfers                        d. Exergonic Reactions
                            e. Stock transactions - it's in the very small print

_______ 5. The Krebs Cycle continually regenerates
                        a. Acetyl Coenzyme A                     b. Pyruvate
                        c. Oxygen                                        d. Oxaloacetate
                                    e. Little tiny Krebs guys

_______ 6.  Which kind of cells would have the most extensive rough endoplasmic 
                                reticulum and Golgi complex?
                        a. Liver cells that detoxify drugs
                        b. Complex bacterial cells
                        c. Glandular cells that produce and secrete a protein hormone
                        d. Cells that are specialized to line body cavities
                        e. The kind that would never call you after saying they would

_______ 7. Virtually any phosphate released into a pond quickly moves into phosphate-rich
                                algae cells due to
                        a. Active transport             b. Facilitated diffusion             c. Respiration
                        d. Photosynthesis                         e. An international conspiracy

_______ 8. A cell whose main job is absorption by diffusion would have lots of
                        a. Vacuoles         b. Mitochondria         c. Ribosomes         d. Microvilli
                                                    e. Great stories to tell

_______ 9. In biological systems, group transfer potential most often involves
                        a. Oxidation             b. Amino acids             c. Reduction
                        d. Phosphates                         e. Boy bands

_______ 10. If glucose contained tritium, an isotope of Hydrogen (³H), after complete
                                oxidation in respiratory pathways, the tritium could be found in
                        a. Sugar                 b. Carbon dioxide                 c. Molecular hydrogen
                        d. Water                                 e. Mississippi

_______ 11.. The permeability of channels in the cell membrane are based upon
                        a. Size only             b. Charge only             c. Size and charge
                        d. Flux rate                         e. Political affiliation

_______ 12. Glycocalex is often used in
                        a. The nuclear matrix         b. Cell markers         c. Microfilaments
                        d. Endoplasmic reticulum         e. Various biology questions

_______13. Joules are used to measure
                        a. Cell-sized distances             b. Energy             c. Entropy
                        d. Group transfer events                 e. Milliseconds of fame

_______ 15.  Lysosomes are linked to which process?
                        a. Gene expression             b. Anabolism             c. Catabolism
                        d. Phosphorylation                         e. Lyso-link

_______ 16. Which is the best description of the molecular structure of a cell membrane?
                        a. A lipid bilayer coated by proteins on the outer and inner surfaces
                        b. An equal mixture of randomly distributed lipid and protein
                        c. An assortment of proteins embedded in a sea of lipids
                        d. A lipid bilayer
                        e. A little of this and a little of the other

_______ 17. When it becomes necessary to metabolize fats, the molecules are
                        a. Converted into sugars and fed into glycolysis
                        b. Converted into acetyls and fed into the Kreb Cycle
                        c. Directly phosphorylated and used to make ATP
                        d. Used to liberate electrons and generate NADPH
                        e. Never coming off your hips

_______ 18. Of transmembrane proteins and phospholipid molecules, which have both
                                 hydrophobic and hydrophilic regions?
                        a. Transmembrane proteins and phospholipids
                        b. Phospholipids only
                        c. Transmembrane proteins only
                        d. Neither
                        e. It depends upon their moods and the phases of the moon

Short Answer.  

Pick NINE questions to answer in the spaces provided.
NOTE: if you answer MORE than nine, only the first nine will be corrected.

Four Points each. Partial credit is possible.

1.  Briefly explain how membrane carriers follow Michaelis-Menten patterns.

7. Briefly define group translocation.

6. What is apoptosis?

7. Give examples of organisms for each grouping -

Producer:	Primary Consumer:
Secondary Consumer:	Decomposer:

8.  What happens in a peroxisome?

9.  What are two possible products of anaerobic respiration?
10. In what two ways can coupled reactions share chemical components?
11. What do centrioles and basal bodies have in common?

12. What are two different structures found in virtually all cells, both prokaryotes and eukaryotes?
13. What are two of the four fundamental forces that can be used to generate energy?
14. Assuming the "box" membrane is permeable to both Substance "A" and water, show with arrows and labels what sort of flux one would expect in this situation -

87% Substance "A" in Water

                                            25% Substance "A" in Water  

15. Give two general uses for ATP in living things:

Long Answer.  

Select and answer completely any four of the following questions.
Note: if you answer more than four, only the first four will be corrected.

1. For the two cell organelles that are thought to have started as endosymbionts:

Short Wavelength \ <-------------Visible Range --------------> / Long Wavelength

4. For the two parts of the photosynthesis process:

BONUS QUESTIONS. Answer as many or as few as you wish. You can't lose points on the rest of the exam by getting these wrong. Partial credit is possible.

What recent discovery about the nucleus did a lot of scientists find surprising? Three Points.

There are almost no examples of true wheels as functional parts of living things. What cell structure comes very close? Three Points.

What body tissues work by setting up and releasing electrical potentials? Two Points each.

What environment is currently thought to have been the likeliest site for the origin of simple living systems? Three Points.

When creationists say that the self-organization needed for many origins of life theories breaks the 2^nd Law of Thermodynamics, what detail are they forgetting or ignoring? Three Points.

Lipids molecules each contain three fatty acids. For Three Points, explain why.