Membrane proteins are fundamental molecules for a. facilitated diffusion b. acti

Question

Membrane proteins are fundamental molecules for a. facilitated diffusion b. active transport c. osmosis d. a and b A plant cell placed in a hypotonic environment will a. plasmolyze b. shrivel c. become turgid d. become flaccid Phagocytosis involves a. the fusion of a newly produced food vacuole with a lysosome b. receptor-mediated endocytosis and the formation of vesicles c. the pinching in of the plasma membrane around small droplets of external fluid d. pseudopod extension and engulfing of an organism Cotransport may involve A. active transport of two solutes through a transport protein B. passive transport of two solutes through a transport protein C. transport of one solute against its concentration gradient in tandem with another that is diffusing down its concentration gradient Facilitated diffusion across a cellular membrane requires ___ and moves a solute ____ its concentration gradient a. energy and transport proteins / down b. energy and transport proteins / up (against) c. energy / up d. transport proteins / down The extracellular fluids that surround the cells of a multicellular animal must be ___ to the cells. a. isotonic b. hypotonic c. hypertonic d. homeostatic LDLs (low density lipoproteins) enter animal cells by: a. diffusion through the lipid bilayer b. pinocytosis c. exocytosis d. receptor-mediated endocytosis The fluid mosaic model describes biological membranes as of consisting of: a. a phospholipid bilayer with proteins sandwiched between the layers b. a lipid bilayer with proteins coating the outside of this hydrophobic structure c. a phospholipid bilayer with proteins embedded in and attached to it d. a protein bilayer with phospholipids embedded in it Passive transport requires ATP a. true b. false The function of membrane receptor proteins is to facilitate the transport of molecules across the plasma membrane a. true b. false What would most likely happen to a cell if it were unable to synthesize and process cholesterol? a. Protein synthesis would be impaired b. Cell reception would be impaired c. Cell transport would be impaired What would most lilkely happen to a cell if it were unable to synthesize its own transport proteins? a. The cell membrane would break b. Cell transport would increase considerably c. Cell transport would decrease considerably Which one of the following phospholipids will provide more fluidity to the cell membrane? a. A phospholipid made of two saturated fatty acids b. A phospholipid made of a saturated fatty acid and an unsaturated fatty acid c. A phospholipid made of two unsaturated fatty acids Imagine a cell surrounded by an extracellular space where the concentration of salt is 1.3%. What would be the direction of water? a. inside the cell b. outside the cell Imagine a cell surrounded by an extracellular space where the concentration of salt is 1.3%. What would be the direction of an ammonia molecule? a. Inside the cell b. Outside the cell

Explanation / Answer

Membrane proteins are fundamental molecules for

a. facilitated diffusion

b. active transport

c. osmosis

d. a and b

A plant cell placed in a hypotonic environment will

a. plasmolyze

b. shrivel

c. become turgid

d. become flaccid

Phagocytosis involves

a. the fusion of a newly produced food vacuole with a lysosome

b. receptor-mediated endocytosis and the formation of vesicles

c. the pinching in of the plasma membrane around small droplets of external fluid

d. pseudopod extension and engulfing of an organism

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