BIOS 100 - Summer, 2004 Name:
Exam I - 16 June, 2004 
Michael Muller, Instructor TA:

This exam consists of 43 questions over 5 pages. Please check to see that all the pages are present before you begin. Use a #2 pencil and bubble in all answers. If you use pen, I will laugh at you! Your score will be posted on the UIC Blackboard site as soon as they are in. Good Luck!

1. Which of the following questions about science is FALSE?
A. Hypotheses can be tested
B. An experiment can prove your hypothesis to be true
C. Theories and hypothesis can be modified over time
D. Data collection is an important component of science
E. All of the above statements about science are TRUE

2. Place the following steps of the scientific method in proper order
I. Ask an initial question
II. Modify hypothesis and perform further experiments
III. Propose a hypothesis
IV. Collect data from experiment
V. Design experiment to test hypothesis
VI. Determine whether data confirm or refute hypothesis

A. I, II, III, IV, V, VI
B. VI, V, IV, III, II, I
C. I, III, V, IV, VI, II
D. I, V, IV, VI, III, II 
E. None of the above

3. What is the difference between 14C and 14N?
A. The number of protons B. The number of electrons C. The number of neutrons D. All of the above

4. Which of the following elements can form the most covalent bonds per atom?
A. Oxygen B. Hydrogen C. Carbon D. Nitrogen E. Silicon
I accepted both answers - Like a dummy, I thought silicon was below oxygen instead of carbon. Sorry.


5. Arrange the bond types from weakest to strongest. 
I. Ionic II. Covalent III. Hydrogen (polar)

A. I, II, III B. I, III, II C. III, I, II D. III, II, I E. II, I, III


6. If NaCl is placed in water, what will happen?
A. The ionic bond will hold and the salt will not dissolve
B. The salt will dissolve and the Cl- will be surrounded by the oxygen-end of water
C. The salt will dissolve and the Cl- will be surrounded by the hydrogen-end of water
D. The Na+ and Cl- will become liquid, but still be strongly attracted to each other
E. None of the above

7. Which of the following molecules do you think is the most hydrophobic?
A. H2O B. C6H12O6 C. Na+ D. C8H18 E. A & C

8. Which of the following statements about water is FALSE? 
A. Water is easy to heat up and loses heat rapidly
B. Water has high surface tension
C. Water has high cohesive and adhesive properties
D. Water has a very high boiling point when compared to molecules of equal size
E. All of the above statements about water are TRUE

9. What is the pH of pure water?
A. 0.0 B. 3.5 C. 7.0 D. 10.5 E. Impossible to tell

10. When paper (C6H12O6) is burned and converted to CO2 and water, we say that the carbon in the paper has been:
A. Oxidized B. Reduced

11. When proteins are broken down to amino acids in your stomach and small intestine, we would say that the protein has been:
A. Condensed B. Hydrolyzed

12. Which of the following molecules has the most energy per gram?
A. Polysaccharides B. Lipids C. Proteins D. Nucleic Acids

13. The picture to the right is and example of a:
A. Polysaccharide B. Lipid C. Protein D. Nucleic Acids

14. Which of the molecules listed below is strongly amphiphatic?
A. Sugar (C6H12O6) B. Water C. Phospholipid D. Na+ E. None of the above

15. A peptide bond joins two:
A. Monosaccharides B. Amino acids C. Phosphoplipids D. Nucleic acids E. None of the above

16. The microfilaments comprising the cytoskeleton are composed of thousands of individual actin subunits joined together. This is an example of protein _______ structure.
A. Primary B. Secondary C. Tertiary D. Quaternary

17. Cell membrane integral proteins typically have:
A. Alpha-helices with hydrophobic -R groups
B. Simple tertiary structures
C. Polysaccharide units associated with the proteins
D. Liposomes 
E. None of the above

18. Which of the following statements about cells is FALSE?
A. All cells arise from other cells
B. All cells acquire and utilize energy
C. All cells contain a plasma membrane and cytoplasm
D. All cells can engage in mechanical activity 
E. All of the above statements about cells are TRUE

19. Which of the following statements about cells is FALSE?
A. Prokaryotic cells were the first to evolve
B. Eukaryotic cells are generally the largest and most complex cell types
C. Today, most Archaeans live in extreme environments
D. Prokaryotic cells have the most diverse morphologies
E. All of the above statements about cells are TRUE

20. Which of the following would you not expect to find in a prokaryotic cell?
A. Plasma membrane composed of phospholipids and proteins
B. Nuclear material in the form of DNA
C. Ribosomes
D. Rough endoplasmic reticulum
E. All of the above are found in prokaryotic cells

21. Animal lack which of the following:
A. Nuclear membrane B. Central vacuole C. Ribosomes D. Mitochondria E. None of the above

22. Cilia and flagella
A. Function in cellular motility
B. Have a distinct 9+2 arrangement of microtubules
C. Are basically the same thing, only that flagella are fewer in number and longer
D. A & B
E. A, B, & C

23. Which of the following is NOT a part of the endomembrane system?
A. Chloroplast B. Rough ER C. Smooth ER D. Lysosome E. All of the above are part of the endomembrane system

24. Which of the following is NOT evidence used to support the endosymbiosis theory of mitochondrial and chloroplast origin?
A. Mitochondria and chloroplasts contain DNA similar in structure to prokaryotes
B. Mitochondria and chloroplasts possess ribosomes synthesize proteins
C. The proteins in mitochondria and chloroplasts are more similar bacterial forms
D. Mitochondria and chloroplasts divide is process similar to binary fission
E. All of the above support the endosymbiosis theory of mitochondrial and chloroplast origin

25. Which of the following membranes is the most fluid?
A. A membrane composed entirely of saturated fats
B. A membrane with composed of saturated fats and cholesterol
C. A membrane composed of unsaturated fats only
D. A membrane composed of unsaturated fats and cholesterol

26. Which of the following statements about mitochondria is FALSE?
A. Mitochondria contain three membranes
B. Mitochondria are the site of aerobic respiration in eukaryotes
C. The matrix of a mitochondria is the soluble portion of the mitochondria and is the site of carbon metabolism
D. Mitochondrial division is independent of cellular division
E. All of the above statements about mitochondria are TRUE

27. Which of the following organelles is most involved packaging and distribution of proteins?
A. Rough ER B. Smooth ER C. Lysosome D. Golgi apparatus E. Central vacuole

28. Which of the following structures of a plant cell are involved in the maintenance of turgor pressure?
A. Cell Wall B. Central vacuole C. Chloroplast D. A & B E. A, B, & C

29. Which of the following statements about membranes is FALSE?
A. The plasma membranes is fluid - there is lateral movement of molecules
B. Membranes are semi-permeable
C. Membrane proteins may be integral or peripheral
D. The plasma membrane of most cells is homogenous 
E. All of the above statements about membranes are TRUE

30. Which of the following molecules is most common in a membrane?
A. Cholesterol B. Phospholipid C. Protein D. Glycoprotein E. None of the above

31. In the ABO blood system, which of the following blood transfusions is unsafe?
A. The donor is blood type O, the recipient is blood type A
B. The donor is blood type O, the recipient is blood type B
C. The donor is blood type A, the recipient is blood type O
D. The donor is blood type A, the recipient is blood type AB
E. None of the above

32. Which of the following molecules will have the slowest rate of diffusion across a membrane?
A. H+ B. O2 C. CO2 D. H2O E. Impossible to tell

Use the key below to answer questions 33 - 35
I. Osmosis II. Diffusion III. Facilitated diffusion IV. Active Transport

33. These processes are passive - they require no expenditure of ATP energy by the cell
A. I, II B. I, II, III C. I, III D. I, II, III, IV

34. Utilize carrier proteins
A. III only B. IV only C. III, IV D. II, III, IV

35. Can move substances against a concentration gradient.
A. IIII only B. IV only C. III, IV D. I, III, IV

36. The surrounding environment is _______ to the central vacuole in a turgid plant cell.
A. Hypertonic B. Hypotonic C. Isotonic

37 Which of the following statements about enzyme active sites is FALSE?
A. Enzymes may be allosterically controlled
B. Only the one substrate can ever fit in the active site
C. Enzymes lower the activation energy of a reaction
D. Enzymes catalyze the forward and the reverse reactions
E. All of the above statements are TRUE

38. Which of the following statements about enzymes is/are TRUE?
A. Enzymes are temperature sensitive
B. Enzymes are pH sensitive
C. Enzymes are light sensitive
D. A & B
E. A, B, and C

39. This is a commonly used system of regulation of biological systems where the product of a reaction sequence inhibits an enzyme in the beginning of the sequence
A. Biosynthsis control B. Feedback inhibition C. Positive feedback regulation D. Product inhibition

40. Which of the following statements about enzymes is TRUE?
A. Most enzymes are not sensitive to pH
B. A competitive inhibitor binds to the allosteric site of an enzyme
C. Increasing the amount of substrate present will increase the rate of a reaction
D. A denatured enzyme is just as functional as one not denatured
E. All of the above statements about enzymes are FALSE

Extra Credit 

41. You would expect the temperature optimum of a plant enzyme to be higher than one of your enzymes.
A. True B. False

42. Animal cells contain mitochondria, but plant cells lack mitochondria
A. True B. False

43. Which of the following make your instructor very tired?
A. Reality TV B. Hot Pockets C. Video Games D. Cheese