Chapter 7

Last update by Babara on 09/08/2014
999140 People have viewed this Quiz
  • Share

The movement of potassium into an animal cell requires

A) low cellular concentrations of sodium.

B) highcellular concentrations of potassium.

C) an energy source such as ATP or a proton gradient.

D) a cotransport protein.

E) a gradient of protons across the plasma membrane.

Answer:

C) an energy source such as ATP or a proton gradient.



View Chapter 7 as Flashcard Deck

Related Quiz Content
  • feldman2009
    Answered in Chapter 7

    Ions diffuse across membranes down their

    A) chemical gradients.

    B) concentration gradients.

    C) electrical gradients.

    D) electrochemical gradients.

    E) A and B are correct.



    D) electrochemical gradients.



  • feldman2009
    Answered in Chapter 7

    What mechanisms do plants use to load sucrose produced by photosynthesis into specializedcells in the veins of leaves?

    A) an electrogenic pump

    B) a proton pump

    C) a contransport protein

    D) A and C only

    E) A, B, and C

    E) A, B, and C
  • feldman2009
    Answered in Chapter 7

    The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions acrossthe plasma membrane. When the proteins of the pump are first synthesized in the rough ER, whatside of the ER membrane will the ATP binding site be on?

    A) It will be on the cytoplasmic side of the ER.

    B) It will be on the side facing the interior of the ER.

    C) It could be facing in either direction because the orientation of proteins is scrambled in the

    Golgi apparatus.

    D) It doesn't matter, because the pump is not active in the ER.



    A) It will be on the cytoplasmic side of the ER.



  • feldman2009
    Answered in Chapter 7

    Proton pumps are used in various ways by members of every kingdom of organisms. Whatdoes this most probably mean?

    A) Proton pumps must have evolved before any living organisms were present on the earth.

    B) Proton pumps are fundamental to all cell types.

    C) The high concentration of protons in the ancient atmosphere must have necessitated a pumpmechanism.

    D) Cells with proton pumps were maintained in each Kingdom by natural selection.

    E) Proton pumps are necessary to all cell membranes.



    D) Cells with proton pumps were maintained in each Kingdom by natural selection.



  • feldman2009
    Answered in Chapter 7

    Several seriously epidemic viral diseases of earlier centuries were then incurable becausethey resulted in severe dehydration due to vomiting and diarrhea. Today they are usually not fatalbecause we have developed which of the following?

    A) antiviral medications that are efficient and work well with all viruses

    B) antibiotics against the viruses in question

    C) intravenous feeding techniques

    D) medication to prevent blood loss

    E) hydrating drinks that include high concentrations of salts and glucose



    E) hydrating drinks that include high concentrations of salts and glucose



  • feldman2009
    Answered in Chapter 7

    An organism with a cell wall would have the most difficulty doing which process?

    A) diffusion

    B) osmosis

    C) active transport

    D) phagocytosis

    E) facilitated diffusion

    D) phagocytosis



  • feldman2009
    Answered in Chapter 7

    White blood cells engulf bacteria through what process?

    A) exocytosis

    B) phagocytosis

    C) pinocytosis

    D) osmosis

    E) receptor-mediated exocytosis



    B) phagocytosis



  • feldman2009
    Answered in Chapter 7

    Familial hypercholesterolemia is characterized by which of the following?

    A) defective LDL receptors on the cell membranes

    B) poor attachment of the cholesterol to the extracellular matrix of cells

    C) a poorly formed lipid bilayer that cannot incorporate cholesterol into cell membranes

    D) inhibition of the cholesterol active transport system in red blood cells

    E) a general lack of glycolipids in the blood cell membranes

    A) defective LDL receptors on the cell membranes



  • feldman2009
    Answered in Chapter 7

    The difference between pinocytosis and receptor-mediated endocytosis is that

    A) pinocytosis brings only water into the cell, but receptor-mediated endocytosis brings in othermolecules as well.

    B) pinocytosis increases the surface area of the plasma membrane whereas receptor-mediatedendocytosis decreases the plasma membrane surface area.

    C) pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediatedendocytosis offers more selectivity.

    D) pinocytosis requires cellular energy, but receptor-mediated endocytosis does not.

    E) pinocytosis can concentratesubstances from the extracellular fluid, but receptor-mediatedendocytosis cannot.




    C) pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity
  • feldman2009
    Answered in Chapter 7

    In receptor-mediated endocytosis, receptor molecules initially project to the outside of thecell. Where do they end up after endocytosis?

    A) on the outside of vesicles

    B) on the inside surface of the cell membrane

    C) on the inside surface of the vesicle

    D) on the outer surface of the nucleus

    E) on the ER



    C) on the inside surface of the vesicle



  • feldman2009
    Answered in Chapter 7

    In what way do the membranes of a eukaryotic cell vary?

    A) Phospholipids are found only in certain membranes.

    B) Certain proteins are unique to each membrane.

    C) Only certain membranes of the cell are selectively permeable.

    D) Only certain membranes are constructed from amphipathic molecules.

    E) Some membranes have hydrophobic surfaces exposed to the cytoplasm, while

    others have hydrophilic surfaces facing the cytoplasm.



    B) Certain proteins are unique to each membrane.