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- https://bio.libretexts.org/Courses/Minnesota_State_Community_and_Technical_College/Biology_of_Human_Concerns_(Daniels)/03%3A_Cells/3.04%3A_Plasma_MembraneThe plasma membrane is a structure that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. The membrane protects and supports the cell and controls everything...The plasma membrane is a structure that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. The membrane protects and supports the cell and controls everything that enters and leaves it.
- https://bio.libretexts.org/Courses/University_of_California_Davis/BIS_2A%3A_Introductory_Biology_(Igo)/Winter_2018_Igo_Readings/W2018_Bis2A_Lecture05_readingpK a is defined as the negative log 10 of the dissociation constant of an acid, its K a . Therefore, the pK a is a quantitative measure of how easily or how readily the acid gives up its proton [H + ]...pK a is defined as the negative log 10 of the dissociation constant of an acid, its K a . Therefore, the pK a is a quantitative measure of how easily or how readily the acid gives up its proton [H + ] in solution and thus a measure of the "strength" of the acid.
- https://bio.libretexts.org/LibreTexts/University_of_California_Davis/BIS_2A%3A_Introductory_Biology_(Igo)/Winter_2018_Igo_Readings/W2018_Bis2A_Lecture05_readingpK a is defined as the negative log 10 of the dissociation constant of an acid, its K a . Therefore, the pK a is a quantitative measure of how easily or how readily the acid gives up its proton [H + ]...pK a is defined as the negative log 10 of the dissociation constant of an acid, its K a . Therefore, the pK a is a quantitative measure of how easily or how readily the acid gives up its proton [H + ] in solution and thus a measure of the "strength" of the acid.
- https://bio.libretexts.org/Courses/Manchester_Community_College_(MCC)/BIOL_106%3A_Essentials_of_Anatomy_and_Physiology_(Anzalone)/03%3A_Cell_Structure_and_Function/3.04%3A_Plasma_MembraneThe plasma membrane is a structure that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. The membrane protects and supports the cell and controls everything...The plasma membrane is a structure that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. The membrane protects and supports the cell and controls everything that enters and leaves it.
- https://bio.libretexts.org/Courses/North_Central_State_College/BIOL_1550%3A_Microbiology_(2025)/03%3A_Macromolecules/3.06%3A_Lipids_-_TriacylglyceridesAlthough they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and...Although they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and functions of organisms. They can be a source of nutrients, a storage form for carbon, energy-storage molecules, or structural components of membranes and hormones. Lipids comprise a broad class of many chemically distinct compounds, the most common of which are discussed in this section.
- https://bio.libretexts.org/Courses/North_Central_State_College/BIOL_1550%3A_Microbiology_(2025)/03%3A_Macromolecules/3.07%3A_Lipids_-_Phospholipids_and_MembraneAlthough they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and...Although they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and functions of organisms. They can be a source of nutrients, a storage form for carbon, energy-storage molecules, or structural components of membranes and hormones. Lipids comprise a broad class of many chemically distinct compounds, the most common of which are discussed in this section.
- https://bio.libretexts.org/Courses/Cosumnes_River_College/Introductory_Anatomy_and_Physiology_(Aptekar)/02%3A_Cells_and_Tissues/2.04%3A_Plasma_MembraneThe plasma membrane is a structure that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. The membrane protects and supports the cell and controls everything...The plasma membrane is a structure that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. The membrane protects and supports the cell and controls everything that enters and leaves it.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/02%3A_The_Molecules_of_Life/2.04%3A_PhospholipidsThis page describes phospholipids as fat derivatives with a phosphate group and nitrogen-containing molecule replacing one fatty acid, creating an amphiphilic structure. An example given is phosphatid...This page describes phospholipids as fat derivatives with a phosphate group and nitrogen-containing molecule replacing one fatty acid, creating an amphiphilic structure. An example given is phosphatidyl ethanolamine (cephalin). These molecules are crucial for cell membranes, forming a bilayer with hydrophilic heads facing water and hydrophobic tails inward.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/03%3A_The_Cellular_Basis_of_Life/3.02%3A_Cell_MembranesThis page explains the plasma membrane as a universal cell feature, acting as a boundary between the interior and environment. It consists of a phospholipid bilayer with hydrophobic tails inward and i...This page explains the plasma membrane as a universal cell feature, acting as a boundary between the interior and environment. It consists of a phospholipid bilayer with hydrophobic tails inward and includes integral and peripheral membrane proteins. Integral proteins traverse the bilayer, while peripheral proteins are loosely attached. Some proteins are fixed in place by the cytoskeleton or extracellular matrix, and others are restricted by tight junctions.
- https://bio.libretexts.org/Courses/Sacramento_City_College/BIOL_440%3A_General_Microbiology_(Hughes)/02%3A_Week_2/02%3A_Microbial_Biochemistry/2.03%3A_LipidsAlthough they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and...Although they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and functions of organisms. They can be a source of nutrients, a storage form for carbon, energy-storage molecules, or structural components of membranes and hormones. Lipids comprise a broad class of many chemically distinct compounds, the most common of which are discussed in this section.
- https://bio.libretexts.org/Courses/City_College_of_San_Francisco/Introduction_to_Microbiology_OER_-_Ying_Liu/03%3A_Macromolecules/3.07%3A_Lipids_-_Phospholipids_and_MembraneAlthough they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and...Although they are composed primarily of carbon and hydrogen, lipid molecules may also contain oxygen, nitrogen, sulfur, and phosphorous. Lipids serve numerous and diverse purposes in the structure and functions of organisms. They can be a source of nutrients, a storage form for carbon, energy-storage molecules, or structural components of membranes and hormones. Lipids comprise a broad class of many chemically distinct compounds, the most common of which are discussed in this section.
