Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 9LTB
Which of the following forms of membrane transport require specific membrane proteins?
- diffusion;
- exocytosis;
- facilitated diffusion;
- active transport;
- facilitated diffusion and active transport
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Which 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.
Which of the following statements is NOT TRUE about membrane transport?
to facilitate movement of ions and molecules across membranes.
to move food, water, and wastes around, into, and out of a cell.
to get rid of duplicated organelles in a cell.
to transport proteins, lipids, and other molecules synthesized by the cell.
Which of the following statements about active processes of membrane transport is true?
cellular energy is required
substances move against its concentration gradient
all requires the aid of proteins during transport
a and b
a, b, and c
Chapter 3 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 3 - Prob. 1LTBCh. 3 - Add labels to the figure that follows, which...Ch. 3 - Prob. 3LTBCh. 3 - Which of the following is not a function of water?...Ch. 3 - Prob. 5LTBCh. 3 - Prob. 6LTBCh. 3 - Prob. 7LTBCh. 3 - Prob. 8LTBCh. 3 - Which of the following forms of membrane transport...Ch. 3 - Prob. 10LTB
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- 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_forwardDifferentiate 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 streamingarrow_forwardWhat type of cellular transport do Epithelial sodium channels (ENaC)s perform? Group of answer choices Simple diffusion Secondary active transport Facilitated diffusion Primary active transportarrow_forward
- Which of the following is true regarding the permeability of the cytoplasmic membrane? Nothing can diffuse across the membrane All molecules can freely diffuse across it Only non-polar molecules can diffuse across the membrane It is generally impermeable to ions, polar moleculesarrow_forwardWhich of the following are features of facilitated diffusion? There may be more than one correct answer, select all that apply. Requires energy Movement assisted by proteins Can include passive diffusion Depends on ATP hydrolysis Can include ion transport down its concentration gradient in a cell (high to low concentration)arrow_forwardWhich of the following would be most likely to move across the membrane without a transport protein? Water, because it is small and polar O2 (molecular oxygen), because it is small and nonpolar A cation, because it is small and positively charged An anion because it is small and negatively chargedarrow_forward
- What is NOT true about diffusion: 1. A form of passive transport. 2. Uses adenosine triphosphate to transport substances across the plasma membrane. 3. Tendency of molecules to move from an area of higher concentration to an area or lower concentration. 4. Classified as either facilitated diffusion or simple diffusion.arrow_forwardWhich of the following membrane transport proteins would you expect to be the most selective at conducting substances into the eukaryotic cell cytoplasm (although not the most rapid)? the bicarbonate ion channel the chloride ion channel the fructose carrier protein the sodium ion channel the potassium ion channelarrow_forwardWhich one of the following will have the least difficulty in crossing the plasma membrane? small charged molecules such as sugars "small, polar, hydrophilic molecules such as water " "small, nonpolar, hydrophobic molecules such as fatty acids" large nonpolar hydrophobic molecules large polar hydrophilic moleculearrow_forward
- Classify each phrase based on whether it describes or gives an example of passive transport, facilitated diffusion, both processes, or neither. Passive transport glucose transport across a membrane Facilitated diffusion cholesterol transport across a membrane protein-assisted movement. Answer Bank Both movement to an area of lower concentration. movement across a membrane Neither requires an input of energyarrow_forwardPassive transport across the membrane mediated by a carrier— would not be saturated by increasing amount of substance to be transported. does not require energy (ATP). can be driven in reverse. moves the solute through the membrane in the “uphill” direction of their concentration gradient. is faster than transport mediated by channel proteins.arrow_forwardWhich of the following statements about diffusion is correct? It is an active process in which molecules move from a region of lower concentration to one of higher concentration. It is very rapid over long distances. It requires an expenditure of energy by the cell. It is a passive process in which molecules move from a region of lower concentration to a region of higher concentration. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.arrow_forward
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