File Name: structure and functions of lipids .zip
- 2.8: Structure and Function - Lipids and Membranes
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- Lipids: Definition, Structure, Function & Examples
Lipids comprise a group of compounds such as fats, oils, steroids and waxes found in living organisms.
Lipids are a group of biological molecules that include fats, oils and some steroids. They are built from fatty acids bonded to a wide range of other compounds. Their importance in the biological world is immense. Of the four molecules of life , lipids arguably have the greatest variation in their basic structure and are far more difficult to define than proteins , carbohydrate and nucleic acids.
2.8: Structure and Function - Lipids and Membranes
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In biology and biochemistry , a lipid is a macro biomolecule that is soluble in nonpolar solvents. The functions of lipids include storing energy, signaling , and acting as structural components of cell membranes. Biological lipids originate entirely or in part from two distinct types of biochemical subunits or "building-blocks": ketoacyl and isoprene groups. Although the term "lipid" is sometimes used as a synonym for fats , fats are a subgroup of lipids called triglycerides. Lipids also encompass molecules such as fatty acids and their derivatives including tri- , di- , monoglycerides , and phospholipids , as well as other sterol -containing metabolites such as cholesterol. Lipid may be regarded as organic substances relatively insoluble in water, soluble in organic solvents alcohol, ether etc. In , Henri Braconnot classified lipids graisses in two categories, suifs solid greases or tallow and huiles fluid oils.
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Lipid , any of a diverse group of organic compounds including fats , oils , hormones , and certain components of membranes that are grouped together because they do not interact appreciably with water. One type of lipid, the triglycerides , is sequestered as fat in adipose cells , which serve as the energy-storage depot for organisms and also provide thermal insulation. Some lipids such as steroid hormones serve as chemical messengers between cells , tissues , and organs , and others communicate signals between biochemical systems within a single cell. The membranes of cells and organelles structures within cells are microscopically thin structures formed from two layers of phospholipid molecules. Membranes function to separate individual cells from their environments and to compartmentalize the cell interior into structures that carry out special functions. So important is this compartmentalizing function that membranes, and the lipids that form them, must have been essential to the origin of life itself. A lipid is any of various organic compounds that are insoluble in water.
Lipids: Definition, Structure, Function & Examples
Lipids are a diverse group of molecules that all share the characteristic that at least a portion of them is hydrophobic. Other, amphipathic lipids, such as glycerophospholipids and sphingolipids spontaneously organize themselves into lipid bilayers when placed in water. Interestingly, major parts of many lipids can be derived from acetyl-CoA. Figure 2. The most ubiquitous lipids in cells are the fatty acids.
Figure 1. Hydrophobic lipids in the fur of aquatic mammals, such as this river otter, protect them from the elements. Lipids include a diverse group of compounds that are largely nonpolar in nature.
Чатрукьян выпрямился и посмотрел. То, что он увидел, больше напоминало вход в преисподнюю, а не в служебное помещение. Узкая лестница спускалась к платформе, за которой тоже виднелись ступеньки, и все это было окутано красным туманом. Грег Хейл, подойдя к стеклянной перегородке Третьего узла, смотрел, как Чатрукьян спускается по лестнице.
А вместо этого он заразил вирусом главный банк данных Агентства национальной безопасности. И этот вирус уже невозможно остановить - разве что вырубить электроэнергию и тем самым стереть миллиарды бит ценнейшей информации. Спасти ситуацию может только кольцо, и если Дэвид до сих пор его не нашел… - Мы должны выключить ТРАНСТЕКСТ! - Сьюзан решила взять дело в свои руки. - Я спущусь вниз, в подсобное помещение, и выключу рубильник.
М-м… сто десять фунтов, - сказала Соши. - Сто десять? - оживился Джабба. - Сколько будет сто десять минус тридцать пять и две десятых.
Пиджак защитного цвета от него отделяли теперь уже только десять человек.