Biology 1406 Exam 2

65 Questions | Total Attempts: 26

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Biology 1406 Exam 2

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Questions and Answers
  • 1. 
    How is glucose (a large and polar molecule) transported inside the cell passively?
    • A. 

      Facilitated transport

    • B. 

      Osmosis

    • C. 

      Simple diffusion

    • D. 

      Active transport

  • 2. 
    What substance influences the fluidity of the plasma membrane? it is a two word answer and spelling matters.
  • 3. 
    Refer to figure below. A U-shaped tube is divided at the center with a semipermeable membrane. The membrane is permeable to water but not permeable to glucose. Each side of the U-shape tube is filled with equal amount of glucose solution, side A with 1% and side B with 10%. The set-up is left for some  time. At equilibrium, what happens to the concentration of the glucose in side A and in side B?
    • A. 

      Theoretically, the concentration of glucose in side A is greater than in side B

    • B. 

      Theoretically, the concentration of glucose in side A is less then side B

    • C. 

      Theoretically, the concentration of glucose in side A and in side B is equal

    • D. 

      Not enough information given to answer

  • 4. 
    A red blood cell (RBC) has a concentration of 0.9% NaCl is put in a beaker with 1.8% NaCl. Assume NaCl is not permeable to membrane. What is the tonicity of the solution inside the RBC in relation to the solution outside the RBC?
    • A. 

      Solution inside the RBC is hypertonic in relation to the solution outside the RBC

    • B. 

      Solution inside the RBC is hypotonic in relation to the solution outside the RBC

    • C. 

      Solution inside the RBC is isotonic in relation to the solution outside the RBC

  • 5. 
    A red blood cell (RBC) has a concentration of 0.9% NaCl is put in a beaker with 1.8% NaCl. Assume NaCl is not permeable to membrane. What will happen to the RBC after sometime?
    • A. 

      RBC will shrink

    • B. 

      RBC will swell

    • C. 

      RBC will stay the same

    • D. 

      RBC will burst

  • 6. 
    The process that is used by animals to secrete digestive enzymes into stomach and small intestines is called [Blank]. It is a one-word answer and spelling matters.
  • 7. 
    Osmosis is the net diffusion of [Blank] molecules across a membrane toward a higher solute concentration. It is a one word answer and spelling matters.
  • 8. 
    Plants that survive winter or tolerate cold temperatures have plenty of (saturated fatty acids / unsaturated fatty acids) in there are their plasma membranes. Type the three words in your answer.
  • 9. 
    Refer to figure below. The blue balls and the red rectangles are two different solutes. Solution with blue solutes is placed in side A of a container and solution with red solutes is placed in side B of the container. The membrane that divides the two solutions is permeable to both solutes. At what direction is the net movement of the blue solutes and red solutes?
    • A. 

      Blue balls stay in side A, red rectangles stay in side B

    • B. 

      Blue balls move from side A to side B, red rectangles stay in side B

    • C. 

      Blue balls stay in side A, red rectangles move from side B to side A

    • D. 

      Blue balls move from side A to side B, red rectangles move from side B to side A

  • 10. 
    Refer to the figure below. The U tube is divided in the center by a semipermeable membrane. The membrane is permeable to water but not to urea. To what direction is the net movement of the water molecules?
    • A. 

      Net movement of water molecules is from side B to side A

    • B. 

      Net movement of water molecules is from side A to side B

    • C. 

      Net movement of water molecules go both directions

  • 11. 
    What carrier proteins move two molecules in opposite directions?
    • A. 

      Uniporters

    • B. 

      Antiporters

    • C. 

      Symporters

    • D. 

      Phagocytosis

    • E. 

      Option 5

  • 12. 
    Which statements are true about Na+/K+ pump?
    • A. 

      It involves the direct use of ATP

    • B. 

      Na+ and K+ move along their concentration gradient

    • C. 

      Na+ and K+ move against their concentration gradient

    • D. 

      It uses carrier proteins

  • 13. 
    Which statements is true about the structure of the plasma membrane?
    • A. 

      It is composed of one layer of a phospholipid and no proteins

    • B. 

      It is composed of two layers of phospholipids and mosaic of proteins

    • C. 

      Has no major components

    • D. 

      Inflexible and hydrophillic

  • 14. 
    Refer to figure below. A U-shaped tube is divided at the center with a semipermeable membrane. The membrane is permeable to water and NaCl but not to protein. Each side of the U-shape tube is filled with equal amount of solution of protein and NaCl, Side a with 6g proteins and 2g NaCl and Side B with 4g protein and 4g NaCl. After some time, what happens to the level of solution in side A?
    • A. 

      Level of solution in side A increases

    • B. 

      Level of solution in side B increases

    • C. 

      Level of solution on both sides stay the same

  • 15. 
    Refer to figure below. The blue balls and the red rectangles are two different solutes. Solution with blue solutes is placed in side A of a container and solution with red rectangles is placed in side B of the container. The membrane that divides the two solutions is permeable to both solutes. At equilibrium, how many blue balls are there in each side of the container?
    • A. 

      No blue balls in side A, 6 blue balls in side B

    • B. 

      4 blue balls in side A, 2 blue balls in side B

    • C. 

      3 blue balls in side A, 3 blue balls in side B

    • D. 

      6 blue balls in side A, no blue balls in side B

  • 16. 
    Differentiate passive transport from active transport
    • A. 

      Passive transport moves materials against the concentration gradient while active transport moves materials along the concentration gradient

    • B. 

      Passive transport requires energy while active transport requires no energy

    • C. 

      Passive transport requires the use of highly selective carrier proteins and active transport does not

    • D. 

      Passive transport moves materials along the concentration gradient while active transport moves materials against the concentration gradient

  • 17. 
    It is a bulk transport process performed by cells and it involves taking in droplets of liquids. It is a one-word answer and spelling matters. Be specific in your answer.
  • 18. 
    Which of the following require ATP to transport substances?
    • A. 

      Exocytosis

    • B. 

      Endocytosis

    • C. 

      Coupled transport

    • D. 

      Sodium-potassium pump

  • 19. 
    By what transport process O2 and CO2 go in and out of the cell? It is a one-word answer and spelling matters.
  • 20. 
    Which processes move from an area of greater concentration to an area of lower concentration?
    • A. 

      Facilitated diffusion

    • B. 

      Osmosis

    • C. 

      Active transport

    • D. 

      Simple diffusion

  • 21. 
    Which proteins are responsible for the transport of substances?
    • A. 

      Glycoproteins

    • B. 

      Peripheral proteins

    • C. 

      Integral membrane proteins

    • D. 

      Intracellular membrane proteins

  • 22. 
    What is the difference between simple diffusion and facilitated diffusion?
    • A. 

      Simple diffusion requires no transport proteins while facilitated diffusion requires transport proteins

    • B. 

      Simple diffusion is the movement of nonpolar molecules while facilitated diffusion is the movement of small molecules

    • C. 

      Simple diffusion requires transport proteins while facilitated diffusion requires no transport proteins

    • D. 

      Simple diffusion repels smaller and larger polar molecules while facilitated diffusion allows O2, CO2, and H2O to diffuse in an out of the plasma membrane

  • 23. 
    If plasma membrane has more saturated fatty acids, the plasma membrane is (more fluid/ less fluid).
  • 24. 
    Semi-permeability of plasma membrane means 
    • A. 

      All substances can pass through

    • B. 

      Some substances can pass through and some cannot

    • C. 

      No substances can pass through

  • 25. 
    Carrot sticks that are left in a dish with fresh tap water for several hours become stiff and hard because the solution inside the cells of the carrot is [Blank] to fresh tap water.
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