Pearson eText Biology: Science for Life with Physiology -- Instant Access (Pearson+)
6th Edition
ISBN: 9780135214114
Author: Colleen Belk, Virginia Maier
Publisher: PEARSON+
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Chapter 3, Problem 10LTB
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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Which 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 charged
Which of the following molecules can freely diffuse across the
membrane?
Glucose
None of these
Water
K+ ions
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.
Chapter 3 Solutions
Pearson eText Biology: Science for Life with Physiology -- Instant Access (Pearson+)
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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- Which plasma membrane component can be either found on its surface or embedded in the membrane structure? a. protein b. cholesterol c. carbohydrate d. phospholipidarrow_forwardWhich of the following molecules would you expect to diffuse through the lipid bilayer of a plasma membrane most slowly, if at all? CO2 O2 CH4-a nonpolar compound A charged molecule Waterarrow_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
- What molecule below does not need assistance crossing the plasma membrane? oxygen glucose sodium ion calcium ionarrow_forwardAll the following is a function of membrane proteins EXCEPT: Cell-cell contact O Protein synthesis Transporting substances cross the membrane O Enzymatic activity which of the following sentences are INCORRECT: All living things are composed of one cells all cells have the same size The cell is the basic structural, O functional, and biological unit of all organisms Robert Hook discovered the cellsarrow_forwardWould it be possible for small ions to passively diffuse (simple diffusion) across a selectively permeable membrane? Why? A Yes, because ions are highly non-polar in nature B Yes, because ions are highly polar in nature No, because it needs the aid of transport proteins to cross the membrane No, because not only transport proteins but also metabolic energy from ATP are needed to transport ions across the plasma membranearrow_forward
- Which of the following would not be able to pass through the plasma membrane without the help of transmembrane proteins. K+ O2 anything with a charge or is polar Two answer choices are correct.arrow_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_forwardWhat components of the plasma membrane might this molecule interact with?arrow_forward
- Passive 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 molecules would you expect to diffuse through the lipid bilayer of a plasma membrane most rapidly? Na+ An amino acid Starch Glucose O2arrow_forwardWhy is it important that some molecules diffuse freely across the membranearrow_forward
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