Biology

Proton pumps are used in various ways by members of every domain of organisms: B

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The sodium-potassium pump in animal cells requires cytoplasmic ATP to pump ions

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Which of the following would increase the electrochemical potential across a mem

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Ions diffuse across membranes through specific ion channels A) down their chemic

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The movement of potassium into an animal cell requires A) low cellular concentra

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Which of the following is most likely true of a protein that cotransports glucos

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In most cells, there are electrochemical gradients of many ions across the plasm

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What is the voltage across a membrane called? A) water potential B) chemical gra

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Glucose diffuses slowly through artificial phospholipid bilayers. The cells lini

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The phosphate transport system in bacteria imports phosphate into the cell even

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In which of the following would there be the greatest need for osmoregulation? A

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Which of the following statements correctly describes the normal tonicity condit

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Mammalian blood contains the equivalent of 0.15 M NaCl. Seawater contains the eq

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Celery stalks that are immersed in fresh water for several hours become stiff an

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Water passes quickly through cell membranes because A) the bilayer is hydrophili

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Which of the following statements is correct about diffusion? A) It is very rapi

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Which of the following is one of the ways that the membranes of winter wheat are

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Which of the following would likely move through the lipid bilayer of a plasma m

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Nitrous oxide gas molecules diffusing across a cell's plasma membrane is an exam

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Which of the following is a characteristic feature of a carrier protein in a pla

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What kinds of molecules pass through a cell membrane most easily? A) large and h

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Why are lipids and proteins free to move laterally in membranes? A) The interior

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Which of the following is true of the evolution of cell membranes? A) Cell membr

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Cell membranes are asymmetrical. Which of the following is the most likely expla

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The formulation of a model for a structure or for a process serves which of the

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