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- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Principles_of_Biology/01%3A_Chapter_1/06%3A_The_Cell_Membrane_and_Transport/6.01%3A_The_Plasma_MembraneThe main fabric of the membrane is composed of two layers of phospholipid molecules, and the polar ends of these molecules (which look like a collection of balls in an artist’s rendition of the model)...The main fabric of the membrane is composed of two layers of phospholipid molecules, and the polar ends of these molecules (which look like a collection of balls in an artist’s rendition of the model) (Figure \(\PageIndex{2}\)) are in contact with aqueous fluid both inside and outside the cell.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/03%3A_The_Cellular_Basis_of_Life/3.24%3A_EndocytosisThis page explains the cellular process of endocytosis, which includes phagocytosis and pinocytosis for absorption of materials. It highlights receptor-mediated endocytosis for acquiring specific mole...This page explains the cellular process of endocytosis, which includes phagocytosis and pinocytosis for absorption of materials. It highlights receptor-mediated endocytosis for acquiring specific molecules like cholesterol. It also discusses familial hypercholesterolemia's link to atherosclerosis due to mutations in the apoB gene and the transportation of hydrophobic molecules in the bloodstream.
- https://bio.libretexts.org/Bookshelves/Biochemistry/Fundamentals_of_Biochemistry_(Jakubowski_and_Flatt)/01%3A_Unit_I-_Structure_and_Catalysis/10%3A_Lipids/10.03%3A_Membrane_Bilayer_and_Monolayer_Assemblies_-_Structures_and_DynamicsThis lengthy document discusses a wide array of biochemical topics, focusing primarily on the detailed structure, dynamics, and function of lipid bilayers and monolayer assemblies in biological system...This lengthy document discusses a wide array of biochemical topics, focusing primarily on the detailed structure, dynamics, and function of lipid bilayers and monolayer assemblies in biological systems. It explores concepts such as bilayer composition, thermodynamics of bilayer formation, membrane microdomains like lipid rafts, and the impact of cholesterol on membrane properties.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/02%3A_The_Molecules_of_Life/2.05%3A_CholesterolThis page discusses the importance of cholesterol as a vital steroid for life, its role in cell membranes and hormone production, and the risks of high LDL levels. Desirable cholesterol levels for adu...This page discusses the importance of cholesterol as a vital steroid for life, its role in cell membranes and hormone production, and the risks of high LDL levels. Desirable cholesterol levels for adults are below 200 mg/dl. Strategies for managing cholesterol include diet, exercise, and medications such as statins, particularly for those at risk of heart disease. It also highlights the complex relationship between dietary fats and cholesterol, noting that unsaturated fats can be beneficial.
- https://bio.libretexts.org/Workbench/Bio_11A_-_Introduction_to_Biology_I/09%3A_The_Cell_Membrane/9.02%3A_The_Plasma_MembraneThe main fabric of the membrane is composed of two layers of phospholipid molecules, and the polar ends of these molecules (which look like a collection of balls in an artist’s rendition of the model)...The main fabric of the membrane is composed of two layers of phospholipid molecules, and the polar ends of these molecules (which look like a collection of balls in an artist’s rendition of the model) (Figure \(\PageIndex{2}\)) are in contact with aqueous fluid both inside and outside the cell.
- https://bio.libretexts.org/Bookshelves/Biochemistry/Book%3A_Biochemistry_Free_and_Easy_(Ahern_and_Rajagopal)/06%3A_Metabolism_I_-_Oxidative_Reductive_Processes/6.08%3A_Cholesterol_MetabolismThe cholesterol biosynthesis pathway is a long one and it requires significant amounts of reductive and ATP energy, which is why it is included here. Cholesterol has important roles in the body in mem...The cholesterol biosynthesis pathway is a long one and it requires significant amounts of reductive and ATP energy, which is why it is included here. Cholesterol has important roles in the body in membranes. It as also a precursor of steroid hormones and bile acids and its immediate metabolic precursor, 7-dehydrocholesterol, is a precursor of Vitamin D. The pathway leading to cholesterol is known as the isoprenoid pathway and branches of it lead to other molecules including other fat-soluble vit
- https://bio.libretexts.org/Courses/Prince_Georges_Community_College/PGCC_Microbiology/03%3A_Cell_Structure_and_Function/3.08%3A_Eukaryotic_Plasma_Membrane_and_The_Cytoplasm/3.8.01%3A_The_Plasma_Membrane_and_Transport/3.8.1.01%3A_The_Plasma_MembraneThe main fabric of the membrane is composed of two layers of phospholipid molecules, and the polar ends of these molecules (which look like a collection of balls in an artist’s rendition of the model)...The main fabric of the membrane is composed of two layers of phospholipid molecules, and the polar ends of these molecules (which look like a collection of balls in an artist’s rendition of the model) (Figure \(\PageIndex{2}\)) are in contact with aqueous fluid both inside and outside the cell.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/02%3A_The_Molecules_of_LifeThis page covers the structure and functions of various organic molecules such as hydrocarbons, fats, phospholipids, cholesterol, carbohydrates, amino acids, and proteins. It details the classificatio...This page covers the structure and functions of various organic molecules such as hydrocarbons, fats, phospholipids, cholesterol, carbohydrates, amino acids, and proteins. It details the classification of hydrocarbons, the composition of fats and phospholipids, the role of cholesterol in cell membranes, and the significance of carbohydrates as glucose polymers. Proteins, essential for life, are derived from amino acids, with their functions influenced by their structures.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/06%3A_Gene_Expression/6.05%3A_RNA_EditingThis page discusses RNA editing, which creates differences between gene sequences and RNA, influencing protein synthesis. It details two mechanisms: Substitution Editing (changing nucleotides) and Ins...This page discusses RNA editing, which creates differences between gene sequences and RNA, influencing protein synthesis. It details two mechanisms: Substitution Editing (changing nucleotides) and Insertion/Deletion Editing (altering sequences with guide RNA). An example is the human APOB gene, where a CAA codon becomes a stop codon, affecting protein production. Additionally, defects in RNA editing are associated with human cancers and diseases like ALS, underlining its importance in biology.
