Essential Cell Biology CH 12 Flashcards Questions and Answers 2023

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What does the plasma membrane do? - -Acts as a control barrier to allow molecules in and out of the cell Blocks almost all water soluble molecules -How are molecules transferred into cells? - -Spe... cialized membrane protiens in the lipid bi-layer each transports only one specific type of molecule -What ions are most plentiful in and around cells? - -Na+, K+, Ca2+, Cl-, and H+ charges inside cells and outside cells must be balance creating different quantities of each ion -What is the most plentiful positively charged ion outside the cell? - -Na+ -What is the most plentiful positively charged ion inside the cell? - -K+ -What ions balance out K+ and Na+ - -Na+ outside the cell is balanced by extra-cellular Cl- K+ is balanced by many different negatively charged ions inside the cell -What types of molecules can diffuse across the lipid bi-layer? - -any given enough time. the smaller more soluble (polar) molecules diffuse faster. molecules that diffuse slowly need special transport proteins to cross faster. (ions, charged molecules, etc) [Show More]

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