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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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.
Enlist the general functions of plasma membrane.
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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_forwardIdentify the polar, inorganic molecule which can pass freely through the plasma membrane. CH3CH2OH (ethanol) C6H12O6 (glucose) H2O (water) C6H6 (benzene) CO2 (carbon dioxide)arrow_forward
- Xena eventually catches Callisto (remember, she is 25 years old). Salmoneus, who is 60 years old, agrees to deliver Callisto to face charges for war crimes. On the way, their cart crashes down a ravine. Salmoneus dies. When a cell dies its plasma membrane becomes “leaky”; i.e., it becomes permeable to ions that were unable to freely cross the membrane during life. Thus, after death, calcium ions leak across the sarcolemma of muscle fibers. This calcium leak causes rigor mortis, a temporary stiffness of the muscles after death. Apply your understanding of the mechanism of skeletal muscle contraction (specifically regarding events within muscle fibre) and explain the molecular basis of the phenomenon known as rigor mortis.arrow_forwardWhich component of the plasma membrane is primarily responsible for forming a physical barrier between the cell’s internal and external environments?arrow_forwardDetermine the function of the plasma membrane.arrow_forward
- Describe the basic composition and structure of the plasma membrane. Discuss the contribution/function of each structure in the cell membrane, including phospholipids, cholesterol, peripheral proteins, transmembrane proteins, glycoproteins, glycolipids and actin filaments.arrow_forwardGive an introduction to the Plasma Membrane.arrow_forwardDefine organelles.arrow_forward
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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license