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Essential Cell Biology

Biology

Quiz 12 :

Transport Across Cell Membranes

Quiz 12 :

Transport Across Cell Membranes

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Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell.Which of the following ions is the most abundant inside a typical mammalian cell?
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Multiple Choice
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Answer:

B

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Ion channels are classified as membrane transport proteins.They discriminate between ions based on size and charge.In addition to Na+, which one of the following ions would you expect to be able to freely diffuse through a Na+ channel? Explain your answer.
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Multiple Choice
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Answer:

B

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Which of the following channels would not be expected to generate a change in voltage by movement of its substrate across the membrane where it is found?
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Multiple Choice
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Answer:

A
A constitutively active phospholipase C will lead to the constitutive production of IP3 and diacylglycerol, leading to activation of PKC in a signal-independent manner; thus, Rafty activation and the lipid modification will be signal-independent.A mutation in the GPCR that bind the signal more tightly and a Ca2+ channel with an increased affinity for IP will increase activity of the signal transduction pathway in a signal-dependent manner.A mutation that renders Rafty such that it can no longer by phosphorylated by PKC will prevent PKC from activating Rafty and will thus prevent the lipid modifications.

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Pumps are transporters that are able to harness energy provided by other components in the cells to drive the movement of solutes across membranes, against their concentration gradient.This type of transport is called
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Active transport requires the input of energy into a system so as to move solutes against their electrochemical and concentration gradients.Which of the following is NOT one of the common ways to perform active transport?
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Which of the following statements about resting membrane potential is FALSE?
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Transporters, in contrast to channels, work by
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Negatively charged ions are required to balance the net positive charge from metal ions such as K+, Na+, and Ca2+.Which of the following negatively charged ions is the most abundant outside the cell and which ion most often neutralize (written in parentheses)?
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Although the extracellular environment has a high sodium ion concentration and the intracellular environment has a high potassium ion concentration, both must be neutralized by negatively charged molecules.In the extracellular case, what is the principal anion?
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Which of the following statements is TRUE?
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You have generated antibodies that recognize the extracellular domain of the Ca2+-pump.Adding these antibodies to animal cells blocks the active transport of Ca2+ from the cytosol into the extracellular environment.What do you expect to observe with respect to intracellular Ca2+?
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Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell.Which of the following negatively charged ions is NOT primarily used to buffer positive charges inside the cell?
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Cells make use of H+ electrochemical gradients in many ways.Which of the following proton transporters is used to regulate pH in animal cells?
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Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell.Which of the following ions is the most abundant outside a typical mammalian cell?
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Below is a list of molecules with different chemical characteristics.Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the option below that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest). Alanine estrogen propanol sodium
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Which of the following occur WITHOUT coupling transport of the solute to the movement of a second solute?
Multiple Choice
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A hungry yeast cell lands in a vat of grape juice and begins to feast on the sugars there, producing carbon dioxide and ethanol in the process: C6H12O6 + 2ADP + 2Pi + H+ → 2CO2 + 2CH3CH2OH + 2ATP + 2H2O Unfortunately, the grape juice is contaminated with proteases that attack some of the transport proteins in the yeast cell membrane, and the yeast cell dies.Which of the following is the most likely cause of the yeast cell's demise?
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The Na+-K+ ATPase is also known as the Na+-K+ pump.It is responsible for maintaining the high extracellular sodium ion concentration and the high intracellular potassium ion concentration.What happens immediately after the pump hydrolyzes ATP?
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Some cells express aquaporin proteins-they are channel proteins that facilitate the flow of water molecules through the plasma membrane.What regulates the rate and direction of water diffusion across the membrane?
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Ca2+-pumps in the plasma membrane and endoplasmic reticulum are important for
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