EBK BIOLOGY
5th Edition
ISBN: 9780133996807
Author: Maier
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 3, Problem 7LTB
Summary Introduction
Introduction:
The cell membrane or plasma membrane is a biological membrane. It separates the internal cellular substances from its outside environment. It is a double layer membrane. It is selectively permeable that means it allows only some of the molecules to enter and exit.
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A substance moving across a membrane against a concentration gradient is moving by:
active transport
facilitated diffusion
passive transport
osmosis
Differentiate the following:
simple diffusion; facilitated diffusion
Facilitated diffusion, active transport
Endocytosis; exocytosis(in terms of purpose, substance transported, direction of motion of the vesicle)
Bulk flow; cytoplasmic streaming
The movement of a substance across a membrane, from low to high concentrations of that substance (requiring the expenditure of energy, often in the form of ATP hydrolysis), is always categorized as:
active transport
facilitated diffusion
simple diffusion
passive transport
osmosis
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- A transport protein requires ATP to pump sodium ions across a membrane. This is a case of ______. a. passive transport b. active transport c. facilitated diffusion d. a and carrow_forwardDistinguish between the following pairs of terms: a. diffusion; osmosis b. passive transport; active transport c. endocytosis; exocytosisarrow_forwardThe tendency of molecules (particles) to extend or spread out from a region of higher concentration to a region of lower concentration. active transport diffusion facilitated diffusion osmosisarrow_forward
- Which of the following processes could result in the net movement of a substance into a cell, if the substance is more concentrated in the cell than in the surroundings? diffusion active transport osmosis facilitated diffusionarrow_forwardCrossing a cell membrane by simple diffusion can be distinguished from facilitated diffusion by which of the following: Select all that apply. Simple diffusion moves molecules down a concentration gradient while facilitated diffusion moves molecules up a concentration gradient Simple diffusion does not require membrane proteins; facilitated diffusion requires specific membrane proteins Simple diffusion does not require energy; facilitated diffusion requires energy Simple diffusion is not saturable; facilitated diffusion rates are limited by the number of functional membrane proteins and can be saturatedarrow_forwardIf a cell is placed in a solution that has the same concentration of solutes as in its cytoplasm, the solution is referred to as: O Isotonic Hypertonic O Hypotonic Osmoticarrow_forward
- Classify each phrase based on whether it describes or gives an example of facilitated diffusion, active transport, or both.arrow_forwardWhat is movement of cell against concentration gradient is called: osmosis active transport diffusion passive transportarrow_forwardWhich of the following is a characteristic of facilitated diffusion (passive transport) of a molecule across a membrane? OOO The rate of transport is saturable. It is highly specific for the molecule being transported. All of the answers are correct. Its rate is higher than that of simple diffusion of the molecule. The direction of transport is determined by concentration and/or electrochemical gradients.arrow_forward
- Facilitated diffusion differs from active transport in that facilitated diffusion transports against a concentration gradient while active transport does not facilitated diffusion requires expenditure of energy while active transport does not active transport requires expenditure of energy while facilitated diffusion does not facilitated diffusion involves carrier proteins while active transport does not facilitated diffusion works against a concentration gradient while active transport works only with the concentration gradientarrow_forwardThe net diffusion of a solvent, across a semi-permeable membrane, from low to high solute concentration, is the precise definition of: simple diffusion facilitated diffusion active transport passive transport osmosisarrow_forwardMovement of one substance in one direction across the cell membrane is a form of transport called: coupled transport co-transport symport antiport uniportarrow_forward
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