workbook-20231011063045209473-Phospholipid-Bilayer-Practice-f

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CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-source, collaborative, and web-based compilation model, CK-12 pioneers and promotes the creation and distribution of high-quality, adaptive online textbooks that can be mixed, modified and printed (i.e., the FlexBook® textbooks). Copyright © 2023 CK-12 Foundation, www.ck12.org The names “CK-12” and “CK12” and associated logos and the terms “FlexBook®” and “FlexBook Platform®” (collectively “CK-12 Marks”) are trademarks and service marks of CK-12 Foundation and are protected by federal, state, and international laws. Any form of reproduction of this content in any format or medium, in whole or in sections, must be attributed according to our attribution guidelines. https://www.ck12info.org/about/attribution- guidelines Except as otherwise noted, all CK-12 Content (including CK-12 Curriculum Material) is made available to Users in accordance with the CK-12 Curriculum Materials License https://www.ck12info.org/curriculum- materials-license Complete terms for use for the CK-12 website can be found at: http://www.ck12info.org/terms-of-use/ Printed: October 11, 2023 1

www. c k 12 .org Phospholipid bilayer Worksheet Visit CK12.org for Free Online Practice 1. Fill in the blank(s): A membrane's ability to allow only specific molecules in or out of the cell is referred to as ____________________. 2. Steroids and lipids cannot easily pass through the cell membrane. a. TRUE b. FALSE 3. Hydrophilic molecules can pass through the cell membrane without assistance. a. TRUE b. FALSE 4. What does hydrophilic mean? a. water-hating b. water-loving c. selective permeability 5. The cell membrane is primarily composed of phospholipids arranged in a bilayer. a. TRUE b. FALSE 6. Hydrophilic molecules "like" the interior of the cell membrane. a. TRUE b. FALSE 7. There is a cell membrane surrounding all cells. 2

www. c k 12 .org a. TRUE b. FALSE 8. Which of the following structures is semipermeable? a. cell membrane b. nucleus c. red blood cells 9. The ability to allow only certain molecules in or out of the cell is referred to as selectively permeability or semi-permeability. a. TRUE b. FALSE 10. Select all possible answers: What are the characteristics of phospholipids in the cell membrane? a. hydrophobic b. hydrophilic c. semi-permeable 3

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www. c k 12 .org Answer Keys 1. semipermeability (or) selective permeability 2. FALSE 3. FALSE 4. water-loving 5. TRUE 6. FALSE 7. TRUE 8. cell membrane 9. TRUE 10. hydrophobic , hydrophilic , semi-permeable 4

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