Multiple Choice


  1. Question 1

    0.4 PointsIn scanning electron microscopy, an electron beam passes through a very thin slice of a specimen and then falls onto a photographic plate or a fluorescent screen.


  2. Question 2

    0.4 PointsConsider the aquatic insects pictured in the accompanying figure. Which characteristic of water molecules directly contributes to their remarkable “water walking” success?


  3. Question 3

    0.4 PointsThe force necessary to cause microtubules of cilia and flagella to slide alongside one another is provided through the action of ____ proteins, which derive the energy to perform their work directly from ____ molecules.


  4. Question 4

    0.4 PointsProteins that are destined to become associated with the inner surface of the plasma membrane are:


  5. Question 5

    0.4 PointsA transmembrane protein differs from other membrane proteins because it:


  6. Question 6

    0.4 PointsA hypothesis can best be described as a(n):


  7. Question 7

    0.4 PointsThe primary purpose of homeostasis is to:


  8. Question 8

    0.4 PointsIn a water molecule, because oxygen is more electronegative than hydrogen, the shared electrons are more commonly found around the ____ nucleus than the ____ nucleus.


  9. Question 9

    0.4 PointsThe smooth ER is the primary site for the synthesis of phospholipids and cholesterol needed to make ____.


  10. Question 10

    0.4 PointsDuring phagocytosis, what may fuse with the vacuole to further degrade the ingested material?


  11. Question 11

    0.4 PointsSuppose a particular protein is produced in excess of the cell’s needs. What kind of mechanism will intervene to stop production?


  12. Question 12

    0.4 PointsEnzymes called proteases in the ER lumen catalyze folding of proteins into proper conformations.__________________


  13. Question 13

    0.4 PointsThe largest and most complex assembly of proteins in most eukaryotic cells are the:


  14. Question 14

    0.4 PointsOsmotic pressure of a solution is the amount of pressure exerted on the side of the selectively permeable containing a higher concentration of solute to prevent diffusion of solute.__________________


  15. Question 15

    0.4 PointsFigure 5-2

    Consider the cellular process illustrated in the accompanying figure. What substance would most likely be used to transport?


  16. Question 16

    0.4 PointsIsotopes differ from each other with respect to the number of:


  17. Question 17

    0.4 PointsSimilar families of organisms are next grouped together in the same:


  18. Question 18

    0.4 PointsIon channels are found in the plasma membranes of neurons and muscle cells.__________________


  19. Question 19

    0.4 PointsHow is paracrine signaling different from other types of signaling?


  20. Question 20

    0.4 PointsIn a lipid bilayer, __________ fatty acid tails face each other within the bilayer and form a region that excludes water.


  21. Question 21

    0.4 PointsHow does the scanning electron microscope differ from the transmission electron microscope?


  22. Question 22

    0.4 PointsIf you observe a cell that contains organelles, then that cell is most likely a(n) prokaryote. __________________


  23. Question 23

    0.4 PointsSimilar orders are placed in the same class.__________________


  24. Question 24

    0.4 PointsAdenylyl cyclase catalyzes the reaction in which:


  25. Question 25

    0.4 PointsMatch the term with its description.PromptsSubmitted Answers

    1. Sticking together of like moleculesChoose a match
    2. Directly responsible for the ability of certain insects to walk on waterChoose a match
    3. Tendency of water to move in narrow tubesChoose a match
    4. Sticking together of unlike moleculesChoose a match


  26. Question 26

    0.4 PointsAn organism that reproduces asexually produces genetically variable offspring.__________________


  27. Question 27

    0.4 PointsPeripheral proteins are linked to either surface of the plasma membrane by:


  28. Question 28

    0.4 PointsIf the concentration of solutes in a cell is less than the concentration of solutes in the surrounding fluid, then the extracellular fluid is said to be:


  29. Question 29

    0.4 PointsIn the sodium-potassium pump, sodium ion release causes two K+ ions to be released into the cell.__________________


  30. Question 30

    0.4 PointsIntermediate filaments are most closely associated with which of the following?


  31. Question 31

    0.4 PointsIf a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first?


  32. Question 32

    0.4 PointsHow do the phospholipids in vegetable oil differ from those of animal fat?


  33. Question 33

    0.4 PointsA chlorine atom has 17 protons and 18 neutrons. What is its atomic mass?


  34. Question 34

    0.4 PointsLDL cholesterol is taken into the cell by receptor-mediated endocytosis.__________________


  35. Question 35

    0.4 PointsAn example of a(n) anion is K+.__________________


  36. Question 36

    0.4 PointsOxidation occurs when an atom gains one or more electrons.__________________


  37. Question 37

    0.4 PointsThe smooth ER is the primary site for the synthesis of proteins and cholesterol needed to make membranes.__________________


  38. Question 38

    0.4 PointsSince sodium-potassium pumps transport sodium ions out of a cell and potassium ions into a cell, what type of carrier proteins are they?


  39. Question 39

    0.4 PointsProteins made on ribosomes may be further modified within which organelle?


  40. Question 40

    0.4 PointsThe outer membrane of the nuclear envelope is continuous with the membrane of the ____ and is usually covered with attached ribosomes.


  41. Question 41

    0.4 PointsSodium-potassium pumps maintain a(n) electrochemical gradient.__________________


  42. Question 42

    0.4 PointsThe valence shell of hydrogen or helium is unstable when it contains two electrons.


  43. Question 43

    0.4 PointsA glycoprotein destined for secretion from the cell would move through the Golgi complex which sequence?


  44. Question 44

    0.4 PointsHow do gap junctions differ from desmosomes?


  45. Question 45

    0.4 PointsMatch the type of bond or interaction with its description.PromptsSubmitted Answers

    1. Strong attractive force resulting from the transfer of electrons between atomsChoose a match
    2. Strong attractive force resulting from the sharing of electrons between atomsChoose a match
    3. Very weak attractive force joining nonpolar moleculesChoose a match
    4. Holds adjacent water molecules togetherChoose a match


  46. Question 46

    0.4 PointsOne of the conclusions drawn from Darwin’s theory of evolution is that:


  47. Question 47

    0.4 PointsDuring an infection, white blood cells travel to the infected site and phagocytize the pathogens. After phagocytosis, primary lysosomes fuse with the phagocytic vesicle to form a larger vesicle called a secondary lysosome. The purpose for this process is to:


  48. Question 48

    0.4 PointsThe covalent bond between a hydrogen atom and the oxygen atom in water is formed when:


  49. Question 49

    0.4 PointsAn atom having a filled valence shell is stable and unreactive.__________________


  50. Question 50

    0.4 PointsInformation in living organisms is transmitted by which mechanism(s)?


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