Fall 2002 Be Sure to Put Your Name

Science 1101/12 Name

Fall 2002 Be sure to put your name

Second Examination on the mark-sense sheet as well

Version A

Directions:

· Be sure to put your name on the mark-sense sheet and on the exam booklet. Both must be turned in at the end of the period.

· Indicate the correct version letter of your exam in the upper left corner of the mark-sense sheet in the box marked “KEY ID.”

· Each questions has only one correct answer. When a group of choices is used for more that one question, a choice may be used more than once.

· You may write in the exam booklet, but only the mark-sense sheet will be graded. No other paper, scratch paper, etc., may be used.

· Students must turn in the exam before leaving the room for any reason. A student may not continue working on the exam after having left the room.

Multiple Choice. 50 questions, 2 pt each.

The following choices are used for questions 1 - 3.

(a) organelle (d) population

(b) organ (e) community

(b) tissue

1. This is a group of individual organisms all belonging to the same species.

2. This is a collection of very similar (or identical) cells that have differentiated for a specific purpose.

3. This is a structural component found within a cell.

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4. The structural boundary that defines the “outside” of all cell types is the

(a) cell wall (d) cytoperiphery

(b) outer limits (e) plasma membrane

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The following choices are used for questions 5 – 8.

(a) endosymbiosis (d) evolution

(b) heredity (e) regulated transport

5. This is the best term to describe the processes by which cells assimilate energy and raw materials from their environment.

6. This is the best term to describe changes in living organisms that result in increased ability to survive and increased diversity of species.

7. This is the best term to describe the mechanism in which genetic traits are passed from one generation to the next.

8. This is the best term to describe a bacterial cell living inside of another cell.

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The following information applies to questions 9 - 12.

Lecithin is a substance composed of two fatty acids and a polar head group (choline), attached to a glycerol molecule.

9. Which of the following best describes the structure of lecithin?

(a) Triglyceride (d) Phospholipid

(b) Amino Acid (e) Disaccharide

10. Which of the following terms best describes the solubility of this substance (overall structure) in water?

(a) hydrophobic (d) dualistic

(b) hydrophilic (e) multiphasic

11. Lecithin is sold in powdered form by chemical supply houses. If some of the powdered form of this substance were mixed thoroughly with water, what would happen?

(a) The substance would separate from the water and float to the top.

(b) The substance would completely dissolve in the water, making a uniform solution.

(c) The substance would form microscopic spherical vesicles, suspended in the water, with the surface of the vesicles made up of lipid bilayers.

12. What is the function of lecithin?

(a) It is a component of protein structure.

(b) It is a component of carbohydrate structure.

(d) It is a component of gene structure.

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The following choices are used for questions 13 – 14.

(a) integral membrane protein

(b) peripheral membrane protein

13. This is a protein that is embedded in a membrane.

14. This is a protein that is attached to the surface of a membrane.

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The following choices are used for questions 15 - 24.

(a) This is a property of prokaryotic cells.

(b) This is a property of eukaryotic cells.

15. Extensive internal membrane systems, including complex organelles surrounded by specialized membranes.

16. Plasma membranes containing folds that carry out metabolic processes of respiration and photosynthesis.

17. A single chromosome, found in a “nucleoid” region, that directs the synthesis of the cell’s RNA.

18. Separation of the cell into many specialized compartments, with the compartments separated from each other by membranes.

19. The ability to utilize energy and raw materials through metabolism.

20. Reproduction by cell division.

21. Animal cells belong to this category.

22. The cells of fungi belong to this category.

23. The cells of algae belong to this category.

24. The cells of bacteria belong to this category.

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The following choices are used for questions 25 - 34.

(a) nucleus (d) mitochondria

(b) ribosome (e) chloroplast

25. This is the location of the process of respiration.

26. This is the location of the cell’s DNA.

27. The Golgi apparatus is a component of this structure.

28. This consists of folded sacks of membranes within the cytoplasm.

29. This is the location of the process of transcription.

30. This is the location of the process of translation.

31. Within this organelle, nutrient molecules are oxidized with the help of oxygen.

32. The endoplasmic reticulum is a component of this structure.

33. This is responsible for processing and export of the cell’s proteins.

34. This is the site of photosynthesis.

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The following choices are used for questions 35 - 36.

(a) Catabolism

(b) Anabolism

35. This term refers to the processes by which a living organism obtains its energy and raw materials from nutrients.

36. This term refers to the processes by which energy and raw materials are used to build macromolecules and cellular structures (biosynthesis).

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37. Which of the following best states the First Law of Thermodynamics?

(a) A body in motion will remain in motion unless acted upon by an outside force, and a body at rest will remain at rest until acted upon by an outside force.

(b) The frequency of alleles in a population tends to remain constant unless changed by mutation, migration, natural selection, or random genetic drift.

(d) The square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides (oh, joy!)

38. In the laboratory exercise in which you measured R-factors in the laboratory (week 2.2), what was the independent variable?

(a) There were three different experimental boxes, each made of a different material.

(b) There were three different light bulbs, each with a different wattage.

(d) more than one of the above

39. How well heat is conducted across a surface depends upon its

(a) thickness

(b) thermal conductivity

(d) more than one of the above

40. The R-factor is a number you’d look at if you were buying

(a) light bulbs

(b) window panes

(d) more than one of the above

41. Thermal conductivity is a property related to

(a) the thickness of a material

(b) the color of a material

(d) the temperature of a material

42. The R-factor is a value that combines the properties of

(a) temperature and heat

(b) luminosity and temperature

(d) thickness and temperature

The following choices are used for questions 43 – 46.

(a) chemoheterotrophic metabolism

(b) chemolithotrophic metabolism

(d) more than one of the above

43. Organisms that use this type of metabolism obtain their energy and raw materials from the catabolism of reduced organic nutrients (for example, Kellogg's Frosted Mini-Wheats).

44. Organisms that use this type of metabolism are able to use CO2 as a raw material (sole carbon source) for anabolism.

45. Organisms that use this type of metabolism are able to carry out the process of carbon fixation.

46. Organisms that use this type of metabolism obtain their energy from reduced inorganic compounds (for example, the hydrogen sulfide found in gasses from volcanic vents).

The following choices are used for questions 47 – 50.

(a) photosynthesis

(b) glycolysis

47. In this process, acetic acid is completely oxidized to form CO2.

48. In this process, water molecules are converted into oxygen (O2).

49. In this process, CO2 is converted into glucose.

50. This process uses light energy harvested by pigments in chloroplast membranes.

Science 1101 Page 7 Exam 2 Version A