Concept explainers
Introduction:
A cell is a structural and functional unit of an organism. Every cell is surrounded by a protective covering called plasma membrane. It controls the entry and exit of substances into and out of the cell. This property is called selective permeability.It also helps in maintaining homeostasis.
Answer to Problem 8STP
Correct answer :
The correct answer is optionD. proteins
Explanation of Solution
Explanation/justification for the correct answer :
OptionD. proteins- An important property of plasma membrane is selective permeability, by which a membrane allows some substances to pass through while keeping others out. This property is important to the survival of a cell. Proteins that are found on the outer surface of plasma membrane called receptors transmit signals to the inside of the cell. Some proteins span the entire membrane and act as tunnels through which certain substances enter and exit the cell. These transport proteins contribute to the selective permeability of the plasma membrane. They transport the needed substances and waste materials through the membrane.
Hence this option is correct.
Explanation for incorrect answer :
Option A. carbohydrates- The carbohydrates are attached to the proteins and stick out from the plasma membraneto define the cell’s characteristics and help cells identify signals. They do not contribute to the selective permeability of the plasma membrane.So, this is an incorrect option.
Option B. ions- Ions do not contribute to the selective permeability of the plasma membrane. So, this is an incorrect option.
Option C. minerals- Minerals do not contribute to the selective permeability of the plasma membrane. So, this is an incorrect option.
Chapter 9 Solutions
Biology Illinois Edition (Glencoe Science)
Additional Science Textbook Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Campbell Biology: Concepts & Connections (9th Edition)
Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (2nd Edition)
Anatomy & Physiology (6th Edition)
Human Biology: Concepts and Current Issues (8th Edition)
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education