WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
3rd Edition
ISBN: 9781319103316
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 3, Problem 4MC
Summary Introduction
Introduction:
The plasma membrane is the layer that holds together the contents of every cell. It is made of two layers of lipid molecules arranged such that the polar heads face outwards and non-polar tails face inwards in the bi-layer.
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Which of the following components of the plasma membrane will help increase fluidity of the memebrane?
a) cholesterol
b) channel proteins
c) phospholipid
d) glycopro
Proteins which are only on one side of the plasma membrane and may not interact with the phospholipids directly. The proteins are often involved in intracellular signialing.
a) cholesterol
b) peripheral protein
c) integral proteins
D) glycolipid
Cell Membranes are:
A)Fully permeable
B)Impereable to all solutes
c) Impereable to 50% of any solutes in a solution
d)selectively permeable
Chapter 3 Solutions
WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
Ch. 3 - Prob. 1SACh. 3 - Prob. 2SACh. 3 - Prob. 3SACh. 3 - Prob. 4SACh. 3 - Prob. 5SACh. 3 - Prob. 6SACh. 3 - Prob. 7SACh. 3 - Prob. 8SACh. 3 - Prob. 9SACh. 3 - Prob. 10SA
Ch. 3 - Prob. 11SACh. 3 - Prob. 12SACh. 3 - Prob. 13SACh. 3 - Prob. 14SACh. 3 - Prob. 15SACh. 3 - Prob. 16SACh. 3 - Prob. 17SACh. 3 - Prob. 18SACh. 3 - Prob. 1MCCh. 3 - Prob. 2MCCh. 3 - Prob. 3MCCh. 3 - Prob. 4MCCh. 3 - Prob. 5MCCh. 3 - Prob. 6MCCh. 3 - Prob. 7MCCh. 3 - Prob. 8MCCh. 3 - Prob. 9MCCh. 3 - Prob. 10MCCh. 3 - Prob. 11MCCh. 3 - Prob. 12MCCh. 3 - Prob. 13MCCh. 3 - Prob. 14MCCh. 3 - Prob. 15MCCh. 3 - Prob. 16MCCh. 3 - Prob. 17MCCh. 3 - Prob. 18MC
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- 3)What is the second type of lipid that plays a major role in the plasma membrane? This lipid does not have polar and nonpolar regions (its not amphiphilic) but plays a critical role in membrane permeability. A)phospholipids b) steroid hormones c) Cholesterol 4)Which one of the following influences the rate at which diffusion can occur? Size of the concentration gradient Mass of the molecule Distance All of the above affect diffusion None of the above affect the diffusion ratearrow_forwardFactors that affect the rate of diffusion through a membrane include all of the following EXCEPT: a)membrane surface area. b) molecular weight. c) availability of energy. d) steepness of concentration gradient.arrow_forwardDiffusion means that a) smaller particles move across the membrane faster. b) all particles cross a membrane. c) particles move around until they are distributed evenly. d) particles stop when they are halfway across the membrane.arrow_forward
- How are the intrinsic proteins in cell membrane distributed?a) Uniformb) Randomc) Symmetricd) Asymmetricarrow_forwardA transmembrane protein contains a stretch of amino acids that crosses the plasma membrane. The side chains of the amino acids that associate with the phospholipid tails are: A) electronegative B) hydrophobic C) ionic D) polar E) hydrophilicarrow_forwardWhich of the following statements about cell membranes is NOT true? A) Membranes are sheet like structures, only two molecules thick, that form closed boundaries between different compartments. B) Membranes consist mainly of lipids and proteins. C) Membranes are very rigid, impermeable structures Membrane lipids are small molecules that have both hydrophilic and hydrophobic moieties. D)arrow_forward
- Typically, our cells have a high concentration of sodium ions outside and a low concentration of sodium ions inside. Sodium ions continue to move out of the cell by the process of: a) secondary active transport b) pinocytosis c) facilitated diffusion d)simple diffusion e) primary active transport f) osmosisarrow_forwardMatch the definitions with the words: Direct Diffusion, Facilitated Transport, Active Transport a) passive movement of molecules through a protein channel, down the solute's concentration gradient b) using a vesicle to move many molecules into a cell c) movement of molecules through a protein transporter, requires ATP, against the solute's concentration gradientarrow_forward1)What is the second type of lipid that plays a major role in the plasma membrane? This lipid does not have polar and nonpolar regions (its not amphiphilic) but plays a critical role in membrane permeability. A)Triglycerdies B) Steriod hormones c) cholesterol 2) In _______________, a single substrate/solute move from a high concentration area to a lower concentration are without the aid of any additional molecules. A) Diffusion B)Facilitated diffusion C) Cotransport 3)Channel proteins require a confirmational change in order to properly function. A) Hydrophilic B) ionic C) Polararrow_forward
- What do facilitated diffusion, primary active transport and secondary active transport have in common? a) their ability to transport molecules depends on a membrane protein b) they utilize energy in the form of ATP to move molecules c) they move small, lipophilic molecules across the membrane d) they can move molecules against a concentration gradientarrow_forwardReceptor mediated endocytosis requires the presence of a) primary active transport pumps. b) D) carrier proteins that move molecules across the membrane into the cytosol. C) specialized proteins on the membrane surface.arrow_forwardWhich of the below statements correctly describes the extracellular matrix? a)A layer that facilitates connections and communications with other cells in a tissue b)A gel like substance that resists compression c)All of the other answers are correct d)a complex mix of proteins and polysaccharides.arrow_forward
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