EBK BIOLOGY
5th Edition
ISBN: 8220101337627
Author: Maier
Publisher: PEARSON
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Chapter 3, Problem 6LTB
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 selectively permeable that means it allows only some of the molecules to enter and exit.
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The non polar portion of the plasma membrane are composed of:
phosphate headgroups
phosphate tails
fatty acid headgroups
fatty acid tails
Identify how each of the following would pass through the plasma membrane: gases, large polar molecules, charged molecules (like ions), hydrophobic molecules, and small polar molecules. Be specific.
"Tight junctions perform two distinct functions: they seal the space between cells to restrict paracellular flow and they fence off plasma membrane domains to prevent the mixing of apical and basolateral membrane proteins" is true or false.
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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_forwardCell membranes consist mainly of a _________. a. carbohydrate bilayer and proteins b. protein bilayer and phospholipids c. phospholipid bilayer and proteinsarrow_forwardEnzymes contained in __________ break down worn-out organelles, bacteria, and other particles. a. lysosomes b. mitochondria c. endoplasmic reticulum d. peroxisomesarrow_forward
- Match each organelle with its correct function.arrow_forwardThe tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobicarrow_forwardPhospholipids ______________ are synthesized in the mitochondria are amphipathic molecules form transmembrane channels spanning through the plasma membrane are stationary in the plasma membrane contain enzymes to oxidize toxic moleculesarrow_forward
- The major function of the plasma membrane is to: define the structure of the organelles. provide genetic information for the cell. synthesize chemicals for metabolism. regulate the passage of molecules and ions.arrow_forwardIdentify the nonpolar, inorganic molecule which can pass freely through the plasma membrane. CH3CH2OH (ethanol) CO2 (carbon dioxide) C12H22O11 (sucrose) C6H12O6 (glucose) C6H6 (benzene)arrow_forwardFor plasma membrane, what macromolecules (carbohydrates, proteins, lipids, or necleic acids contribute to the organelle functionarrow_forward
- Enlist the general functions of plasma membrane.arrow_forwardBecause the plasma membrane is selectively permeable, nothing can diffuse through the bilayer. True or Falsearrow_forwardThe plasma membrane consists mainly of: A Proteins embedded in a carbohydrate bilayer B Phospholipids embedded in a protein bilayer C Proteins embedded in a phospholipid bilayer D Proteins embedded in a polymer of glucose moleculesarrow_forward
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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license