Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 5, Problem 1TYK

In the fluid mosaic model:

plasma membrane proteins orient their hydrophilic sides toward the internal bilayer.

phospholipids often flip-flop between the inner and outer layers.

the mosaic refers to proteins attached to the underlying cytoskeleton.

the fluid refers to the phospholipid bilayer.

the mosaic refers to the symmetry of the internal membrane proteins and sterols.

Expert Solution & Answer
Check Mark
Summary Introduction

Introduction:

The membrane of the cell is composed of the phospholipid bilayer and proteins. The structure of the membrane is explained by the fluid-mosaic model proposed by Singer and Nicolson. The proteins are distributed unevenly in the bilayer of the lipids.

Answer to Problem 1TYK

Correct answer:

The fluid in the fluid-mosaic refers to the bilayer of phospholipids.

Explanation of Solution

Explanation for the correct answer:

Option (d) is given that thephospholipid bilayer is the fluid part of the membrane. The cellular membrane is formed of the phospholipids and proteins. The fluidity of the membrane is imparted by the phospholipid bilayer, which is amphipathic in nature. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) is given that the hydrophilic sides of the membrane proteins are present towards the internal layer. The proteins present in the membrane are hydrophilic in nature and are present towards the cytosolic or outer sides. They are attracted towards water and span the membrane. So, it is an incorrect option.

Option (b) is given that phospholipids often flip-flop in the layer. The phospholipid layer of the membrane is continuous and uniform. The lipid molecules move sideways rather than flip-flop movement across the inner and outer sides of the membrane. So, it is an incorrect option.

Option (c) is given that the protein attached to the cytoskeleton forms the mosaic part. The mosaic portion of the membrane is formed by the protein. Proteins span the membrane and are present on both the outer and inner sides of the membrane. The inner proteins are attached to the cytoskeleton. So, it is an incorrect option.

Option (e) is given that the mosaic is formed by the symmetry of the internal proteins and sterols. The mosaic region comprises the total proteins present in the membrane. Proteins are unevenly distributed in the membrane. So, it is an incorrect option.

Hence, options (a), (b), (c), and (e) are incorrect.

Conclusion

Therefore, it is concluded that the fluid part of the membrane is formed by the phospholipid bilayer, while the mosaic region is formed by the total protein of the membrane.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
Older adults have unique challenges in terms of their nutrient needs and physiological changes. Some changes may make it difficult to consume a healthful diet, so it is important to identify strategies to help overcome these obstacles. From the list below, choose all the correct statements about changes in older adults. Select all that apply.   Poor vision can make it difficult for older adults to get to a supermarket, and to prepare meals. With age, taste and visual perception decline. As people age, salivary production increases. In older adults with dysphagia, foods like creamy soups, applesauce, and yogurt are usually well tolerated. Lean body mass increases in older adults.
When physical activity increases, energy requirements increase also. Depending on the type, intensity, and duration of physical activity, the body’s requirements for certain macronutrients may change as well. From the list below, choose all the correct statements about the effects of increased physical activity or athletic training. Select all that apply. An athlete who weighs 70 kg (154 lb) should consume 420 to 700 g of carbohydrate per day. How much additional energy an athlete needs depends on the specific activity the athlete engages in and the frequency of the activity. Those participating in vigorous exercise should restrict their fat intake to less than 15%% of total energy intake. Athletes who are following energy-restricted diets are at risk for consuming insufficient protein. The recommendation to limit saturated fat intake to less than 10%% of total energy intake does not apply to athletes or those who regularly engage in vigorous physical activity.
When taking vitamins and vitamin-mineral supplements, how can one be sure they are getting what they are taking?
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Text book image
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning
Text book image
Human Biology (MindTap Course List)
Biology
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cengage Learning
Text book image
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Biology
ISBN:9781305967359
Author:STARR
Publisher:CENGAGE L
The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license