Biology Illinois Edition (Glencoe Science)
7th Edition
ISBN: 9780078759864
Author: Alton Biggs
Publisher: MCG
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Chapter 7, Problem 15A
Summary Introduction
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.
Expert Solution & Answer
Answer to Problem 15A
C. increasing the number of cholesterol molecules
Explanation of Solution
Explanation/justification for the correct answer :
C. increasing the number of cholesterol molecules- Cholesterol molecules are nonpolar and are positioned among the phospholipids in such a way that they prevent the fatty acid tails of the phospholipid bilayer from sticking together. This causes fluidity in the plasma membrane. If the number of cholesterol molecules is increased, the fluidity of plasma membrane will increase.
Hence this option is correct.
Explanation for incorrect answer :
A. decreasing the temperature- This will not affect the fluidity of the plasma membrane. So, this is an incorrect option.
B. increasing the number of proteins- Proteins help in transport of substances and waste materials through the plasma membrane. Fluidity is caused by the cholesterol molecules. So, this is an incorrect option.
D. increasing the number of unsaturated fatty acid- Cholesterol which is a type of lipid contributes to the fluidity of plasma membrane. Unsaturated fatty acid cannot cause fluidity. So, this is an incorrect option.
Chapter 7 Solutions
Biology Illinois Edition (Glencoe Science)
Ch. 7 - Prob. 1ACh. 7 - Prob. 2ACh. 7 - Prob. 3ACh. 7 - Prob. 4ACh. 7 - Prob. 5ACh. 7 - Prob. 6ACh. 7 - Prob. 7ACh. 7 - Prob. 8ACh. 7 - Prob. 9ACh. 7 - Prob. 10A
Ch. 7 - Prob. 11ACh. 7 - Prob. 12ACh. 7 - Prob. 13ACh. 7 - Prob. 14ACh. 7 - Prob. 15ACh. 7 - Prob. 16ACh. 7 - Prob. 17ACh. 7 - Prob. 18ACh. 7 - Prob. 19ACh. 7 - Prob. 20ACh. 7 - Prob. 21ACh. 7 - Prob. 22ACh. 7 - Prob. 23ACh. 7 - Prob. 24ACh. 7 - Prob. 25ACh. 7 - Prob. 26ACh. 7 - Prob. 27ACh. 7 - Prob. 28ACh. 7 - Prob. 29ACh. 7 - Prob. 30ACh. 7 - Prob. 31ACh. 7 - Prob. 32ACh. 7 - Prob. 33ACh. 7 - Prob. 34ACh. 7 - Prob. 35ACh. 7 - Prob. 36ACh. 7 - Prob. 37ACh. 7 - Prob. 38ACh. 7 - Prob. 39ACh. 7 - Prob. 40ACh. 7 - Prob. 41ACh. 7 - Prob. 42ACh. 7 - Prob. 44ACh. 7 - Prob. 45ACh. 7 - Prob. 47ACh. 7 - Prob. 1STPCh. 7 - Prob. 2STPCh. 7 - Prob. 3STPCh. 7 - Prob. 4STPCh. 7 - Prob. 5STPCh. 7 - Prob. 6STPCh. 7 - Prob. 7STPCh. 7 - Prob. 8STPCh. 7 - Prob. 9STPCh. 7 - Prob. 10STPCh. 7 - Prob. 11STPCh. 7 - Prob. 12STPCh. 7 - Prob. 13STPCh. 7 - Prob. 14STPCh. 7 - Prob. 15STPCh. 7 - Prob. 16STPCh. 7 - Prob. 17STPCh. 7 - Prob. 18STPCh. 7 - Prob. 19STPCh. 7 - Prob. 20STP
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