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Quiz 002 Key

Quiz 002

The Cell

1.)   Which ion is primarily responsible for establishing the resting membrane potential?

  1. Na+ (sodium)
  2. Cl- (chloride)
  3. K+ (potassium)
  4. Ca2+ (calcium)

2.)  During which stage of protein synthesis is the mRNA strand created?

  1. Transcription
  2. Translation

3.)  Proteins that are destined to be exported from the cell are produced by______

  1. Membrane bound ribosomes (on the rough ER)
  2. Free floating cytoplasmic ribosomes

4.)  Peroxisomes are produced by which organelle?

  1. Nucleus
  2. Endoplasmic Reticulum

5.)  Lysosomes are produced by which organelle?

  1. Golgi apparatus
  2. Centrioles

6.)  Which cytoskeletal component has the largest diameter

  1. Microfilaments
  2. Microtubules

7.)  Which transport process maintains the steep ionic concentration gradients of Na+ and K+?

  1. Diffusion
  2. Osmosis
  3. Active Transport

8.)  Which is fluid compartment is more negative in charge?

  1. The Intracellular fluid
  2. The extracellular fluid
  3. Both fluid compartments have an equal charge

9.)  Which cell would you expect to have the most highly developed smooth endoplasmic reticulum?

  1. A cell involved in lipid metabolism
  2. A cell involved in protein export
  3. A cell involved in blood filtration

10.)                 Which of the following cells would you expect to have the highest number of lysosomes?

  1. A cell that is heavily involved in phagocytosis
  2. A cell involved in protein export

2 comments on “Quiz 002 Key

  1. Pam U.
    September 27, 2013

    Hello Professor!
    Could you please explain question #8 and why that is the answer? Thank you!

  2. tlohman2
    September 27, 2013

    This is a bit of a trick question Pam,

    You are probably thinking wait a sec, I thought the inside of the cell membrane was more negative than the outside. That is absolutely true, in fact the inside of the cell membrane is about -70 millivolts more negatively charged than the outside.

    The question however, isn’t asking about charge across the membrane. It is asking about the charge of the fluid compartments (intracellular versus extracellular fluid). Remember, the charge separation (resting membrane potential) exists only at the membrane. If you average all of the charged particles within the intracellular fluid, and compare it to an average of the charged particles in the extracellular fluid, their charges would be exactly the same.

    Read the quick review section on membrane potential for more detail.

    https://aandpsource.wordpress.com/2013/09/25/membrane-potential/

    Hope that helps!

    Trevor

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