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Chapter 5: Problem 20

List four components of a plasma membrane and explain their function. a. Phospholipids: form the bilayer, Carbohydrates: help in adhesion; Cholesterol: provide flexibility; Integral proteins: form transporters; Peripheral proteins: part of the cell's recognition sites. b. Phospholipids: form the bilayer, Carbohydrates: help in adhesion; Cholesterol: form transporters; Integral proteins: provide flexibility, Peripheral proteins: part of the cell's recognition sites. c. Phospholipids: form the bilayer, Carbohydrates: part of the cell's recognition sites; Cholesterol: provide flexibility to the membrane; Integral proteins: form transporters; Intermediate filaments: help in adhesion. d. Phospholipids: form the bilayer; Carbohydrates: function as adhesion; Cholesterol: provide flexibility to the membrane, Integral proteins: form transporters; Intermediate filaments: part of the cell's recognition sites.

Short Answer

Expert verified
The correct answer is option a.

Step by step solution

01

Identify Components and Functions

List the components and their corresponding functions. The components mentioned are: Phospholipids, Carbohydrates, Cholesterol, Integral proteins, Peripheral proteins, Intermediate filaments.
02

Verify Correct Function of Each Component

Examine the list of functions provided and match them to the correct components based on knowledge of cell biology. Phospholipids form the bilayer, Carbohydrates help in adhesion or function as recognition sites, Cholesterol provides flexibility, Integral proteins form transporters, Peripheral proteins are involved in recognition, and Intermediate filaments help in adhesion.
03

Compare with Given Options

Evaluate each option against the correct functions: Option a: Correct except Peripheral proteins for recognition is correct, but it doesn't mention Intermediate filaments.Option b: Incorrect because Cholesterol is incorrectly associated with forming transporters.Option c: Incorrect because Intermediate filaments incorrectly listed as helping in adhesion, Carbohydrates listed in recognition.Option d: Incorrect because Intermediate filaments incorrectly listed as recognition components.
04

Choose the Correct Answer

Based on the analysis, option a is the correct answer, matching all components and their respective functions accurately except for missing Intermediate filaments which still makes it most appropriate.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

phospholipid bilayer
The phospholipid bilayer is the fundamental structure of the plasma membrane. It is made up of two layers of phospholipids which form a barrier between the interior of the cell and the external environment.
Each phospholipid molecule has a hydrophilic (water-attracting) 'head' and two hydrophobic (water-repelling) 'tails.' The hydrophilic heads face outward towards the water inside and outside the cell, while the hydrophobic tails face inward, shielded from water. This arrangement allows the membrane to be fluid and flexible while maintaining its integrity.
The phospholipid bilayer serves as a selective barrier, allowing only certain molecules to cross in and out of the cell, maintaining the proper environment for cellular function.
cholesterol function
Cholesterol is an essential component of the plasma membrane, interspersed among the phospholipids. It plays a crucial role in maintaining the flexibility and fluidity of the membrane.
Cholesterol molecules fit snugly between the phospholipid molecules, making the membrane less permeable to very small water-soluble molecules that might otherwise pass freely through.
This not only enhances membrane stability but also prevents it from becoming too fluid or too rigid, allowing the cell to function properly under a variety of environmental conditions. Cholesterol helps in the formation of lipid rafts, which are microdomains that compartmentalize cellular processes.
integral proteins
Integral proteins are a type of membrane protein that is permanently attached to the plasma membrane. These proteins span the entirety of the membrane, from one side to the other.
One of the primary roles of integral proteins is to facilitate the transport of molecules across the cell membrane. They act as channels or carriers that allow specific substances (such as ions, nutrients, and waste products) to enter or exit the cell.
Integral proteins are essential for maintaining the proper environment within the cell, contributing to signal transduction, and enabling various cellular processes to occur smoothly. They are involved in processes such as cell signaling and interactions with the extracellular matrix.
peripheral proteins
Peripheral proteins are membrane proteins that are not embedded in the lipid bilayer. Instead, they are loosely attached to the exterior or interior surfaces of the membrane, often connected to integral proteins or the phospholipid heads.
These proteins play significant roles in cell membrane recognition and signaling. They act as attachment points for cytoskeleton elements, which help in maintaining the cell's shape and structure.
Peripheral proteins can also be involved in a variety of cellular functions such as enzyme activity, cell signaling, and providing mechanical support. They are important for the cell's response to its environment and interactions with other cells.
cell membrane recognition
Cell membrane recognition involves specific molecules that enable a cell to identify and interact with other cells and its environment. This recognition is crucial for processes such as immune response, tissue formation, and cellular communication.
Glycoproteins and glycolipids, which consist of carbohydrates attached to proteins and lipids, play a key role in cell recognition. These molecules are found on the outer surface of the plasma membrane.
These carbohydrate chains act like molecular 'name tags' that allow cells to recognize each other, facilitating interactions like immune responses where cells must identify and respond to pathogens. Cell membrane recognition is fundamental for the proper functioning of multicellular organisms.

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Most popular questions from this chapter

How does the sodium-potassium pump contribute to the net negative charge of the interior of the cell? a. The sodium-potassium pump forces out three (positive) \(\mathrm{Na}^{+}\) ions for every two (positive) \(\mathrm{K}^{+}\) ions it pumps in, thus the cell loses a net positive charge of one at every cycle of the pump. b. The sodium-potassium pump expels three ions \(\mathrm{K}^{+}\) for every two \(\mathrm{Na}^{+}\) inside the cells, creating a net positive charge outside the cell and a net negative charge inside the cell. c. The sodium-potassium pump helps the development of negative charge inside the cell by making the membrane more permeable to negatively charged proteins. d. The sodium-potassium pump helps in the development of negative charge inside the cell by making the membrane impermeable to positively charged ions.

Why is it advantageous for the plasma membrane to be fluid in nature? a. Fluidity allows greater flexibility to the cell and motion of membrane components required for transport. b. Fluidity helps only in transport of some materials, and does not contribute to the flexibility. c. Fluidity helps in maintaining the pH of intracellular fluid, and helps in maintaining the physiological pH of the cell. d. Fluidity helps in providing mechanical strength to the plasma membrane.

Arsenic poisoning disrupts ATP production by inhibiting several of the enzymes in the oxidative phosphorylation pathway. Some of the symptoms of arsenic poisoning are similar to cystic fibrosis (difficulty breathing and frequent lung infections). Explain what impact arsenic poisoning may have on components of the plasma membrane and transport that result in CF like symptoms. a. Arsenic poisoning disrupts ATP production, leading to decreased transport of \(\mathrm{Cl}^{-}\) ions by epithelial cells. This leads to decreased electrolyte concentration in the mucus and retention of water into the cells. The mucus becomes dehydrated, as in CF. b. Arsenic poisoning disrupts the \(\mathrm{Na}^{+} / \mathrm{Cl}^{-}\) pump, leading to decreased transport of \(\mathrm{Cl}^{-}\) ions outside the epithelial cells. This increases the electrolyte concentration in the mucus and movement of water out of the cells. The mucus becomes hydrated as in CF. c. Arsenic poisoning affects the oxidative phosphorylation pathway, leading to decreased transport of \(\mathrm{Na}^{+}\) ions outside the epithelial cells. This leads to increased electrolyte concentration in the mucus and movement of water into the cells. The mucus becomes dehydrated as in CF. d. Arsenic poisoning disrupts the binding sites for \(\mathrm{Cl}^{-}\) ions, leading to decreased transport of \(\mathrm{Cl}^{-}\) ions outside the epithelial cells. This leads to decreased electrolyte concentration in the mucus and movement of water outside the cells. The mucus becomes hydrated as in CF.

Describe the process of potocytosis and explain how it differs from pinocytosis. a. Potocytosis is a form of receptor-mediated endocytosis where molecules are transported via caveolae-coated vesicles. Pinocytosis is a form of exocytosis used for excreting excess water. b. Potocytosis is a form of exocytosis where molecules are transported via clathrin-coated vesicles. Pinocytosis is a form of receptor- mediated endocytosis used for excreting excess water. c. Potocytosis is a form of receptor-mediated endocytosis where molecules are transported via caveolae-coated vesicles. Pinocytosis is a mode of endocytosis used for absorption of extracellular water. d. Potocytosis is a form of receptor-mediated endocytosis used for absorption of water. Pinocytosis is a mode of endocytosis used for excretion of extracellular water.

Why do phospholipids tend to spontaneously orient themselves into something resembling a membrane? a. Phospholipids are amphipathic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails. b. Phospholipids are lipophilic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails c. Phospholipids are amphipathic molecules. The nonpolar head faces towards other fatty acid tails and the polar fatty acid tails face towards water. d. Phospholipids are hydrophilic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails.
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