Featured Post

Test 2

Fill in the blanks. Movement of materials in and out of cells is controlled by the_________________. The sites of protein synthesis are______________________. Glycerol and fatty acids combine to form___________________. Breakdown of organic nutrients in cells to release energy and form ATP is called_________________. In a__________________reaction, smaller molecules are combined to form a larger molecule. The building units of proteins are____________________. Choose the correct answer. Which of the following are functions of nucleic acids? They pass instructions from parents to offspring. They help make proteins. They contain instructions for proteins. all of the above. Types of lipids include: polysaccharides. amino acids. nucleotides. triglycerides. According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly spread in a continuous layer over the inner and outer surfaces of the membrane. confined to the hydrophobic int...
Post a Comment

ភ្នាសប្លាស្មា-Plasma Membrane

ភ្នាសប្លាស្មា

Plasma Membrane

  • plasma membrane ភ្នាសប្លាស្មា ឬ ភ្នាសកោសិកា ឬ ភ្នាសស៊ីតូប្លាស
  • intracellular substances សារធាតុនៅក្នុងកោសិកា
  • extracellular environment មជ្ឈដ្ឋានក្រៅកោសិកា
The plasma membrane is the outermost component of a cell. It functions as a boundary separating the intracellular substances, those inside the cell, from extracellular substances, those outside the cell. The plasma membrane encloses and supports the cell contents. It attaches cells to the extracellular environment or to other cells. The ability of the cells to recognize and communicate with each other occurs through the plasma membrane.
ភ្នាសប្លាស្មា ជាផ្នែកខាងក្រៅបង្អស់របស់កោសិកា។ វាដើរតួជារបាំងដែលខ័ណ្ឌចែកសារធាតុក្នុងកោសិកាពីសារធាតុផ្សេងៗខាងក្រៅកោសិកា។ ភ្នាសប្លាស្មា រុំព័ទ្ធ និងទ្រទ្រង់សមាសភាគក្នុងកោសិកា។ វាភ្ជាប់កោសិកាទៅនឹងមជ្ឈដ្ឋានខាងក្រៅ ឬទៅនឹងកោសិកាផ្សេងៗទៀត។ ភ្នាសនេះ ក៏ជួយឱ្យកោសិកាអាចទទួលស្គាល់ និងមានទំនាក់ទំនងជាមួយគ្នាបានផងដែរ។
Plasma Membrane
In addition, the plasma membrane determines what moves into and out of cells. As a result, the intracellular contents of cells are different from the extracellular environment.
លើសពីនេះ ភ្នាសប្លាស្មា កំណត់នូវសារធាតុដែលអាចចេញនិងចូលទៅក្នុងកោសិកាបាន ដែលជាហេតុ ធ្វើឱ្យសមាសធាតុនៅខាងក្នុងកោសិកា ខុសពីនៅក្នុងមជ្ឈដ្ឋានខាងក្រៅរបស់វា។
An electrical charge difference across the plasma membrane called the membrane potential is a result of the cell’s regulation of ion movement into and out of the cell. Because there are more positively charged ions immediately on the outside of the plasma membrane and more negatively charged ions and proteins inside, the outside of the plasma membrane is positively charged, compared with the inside of the plasma membrane. The membrane potential is an important feature of a living cell’s normal function.
  • charged ions អុីយ៉ុងមានបន្ទុក
  • carbohydrates កាបូអុីដ្រាត
  • glycoproteins គ្លីកូប្រូតេអុីន
  • glycocalyx គ្លីកូកាលិក
  • glycolipids គ្លីកូលីពីត
  • physical barrier របាំងរូប
  • electrical charge បន្ទុកអគ្គិសនី
  • lipid bilayer លីពីទ្វេស្រទាប់
The plasma membrane consists primarily of lipids and proteins, with a very small amount of carbohydrates. Lipids account for 45–50% of the plasma membrane volume, and proteins make up 45–50% of the plasma membrane. A small percentage of the plasma membrane (4–8%) is carbohydrates, which are found only on the outer surface of the plasma membrane. The carbohydrates can combine with lipids to form glycolipids and they can combine with proteins to form glycoproteins. The glycocalyx is the collection of glycolipids, glycoproteins, and carbohydrates on the outer surface of the plasma membrane. The glycocalyx also contains molecules absorbed from the extracellular environment, so there is often no precise boundary between the plasma membrane and the extracellular environment.
ភ្នាសប្លាស្មា បង្កឡើងភាគច្រើនពីលីពីត និងប្រូតេអុីន ហើយមានកាបូអុីដ្រាតក្នុងបរិមាណតិចតួច។ វាមានលីពីតប្រមាណ ៤៥ ទៅ ៥០ ភាគរយ និង ប្រូតេអុីន ៤៥ ទៅ ៥០ ភាគរយ។ រីឯកាបូអុីដ្រាត មានភាគរយតិចតួច(៤ ទៅ ៨ ភាគរយ) ដែលមានតែនៅលើផ្ទៃខាងក្រៅរបស់ភ្នាសនេះប៉ុណ្ណោះ។ កាបូអុីដ្រាត ភ្ជាប់ជាមួយលីពីត​បង្កើតបានជា គ្លីកូលីពីត ហើយវាអាចភ្ជាប់ជាមួយប្រូតេអុីន បង្កើតជា គ្លីកូប្រូតេអុីន។ គ្លីកូកាលិក គឺជាបណ្ដុំដែលកើតពីគ្លីកូលីពីត គ្លីកូប្រូតេអុីន និងកាបូអុីដ្រាតស្ថិតនៅលើផ្ទៃខាងក្រៅនៃភ្នាសប្លាស្មា។ គ្លីកូកាលិក ក៏ផ្ទុកនូវម៉ូលេគុលដែលស្រូបបានពីមជ្ឈដ្ឋានខាងក្រៅកោសិកា ដែលជាហេតុ ធ្វើឱ្យវាគ្មានព្រំខណ្ឌច្បាស់លាស់រវាងភ្នាសប្លាស្មានិងមជ្ឈដ្ឋានខាងក្រៅកោសិកានោះទេ។

Structure and function of the cell membrane
Structure Function
The lipid bilayer is composed of phospholipids and cholesterol; proteins extend across or are embedded in either surface of the lipid bilayer Acts as a physical barrier to enclose cell contents; regulates material movement into and out of the cell; establishes and maintains an electrical charge difference across the plasma membrane; functions in cell communication

Comments

Post a Comment

សំណួរ ឬយោបល់ផ្សេងៗ

Popular posts from this blog

Chemical Reactions and Energy

Image
Synthesis Reactions A chemical reaction occurs when atoms, ions, molecules, or compounds interact either to form or to break chemical bonds. Reactants are substances that enter into a chemical reaction, whereas the substances that result from the chemical reaction are called products. A synthesis reaction is when two or more reactants chemically combine to form a new and larger product. The synthesis reactions occurring in the body are collectively referred to as anabolism. These reactions produce the molecules characteristic of life, such as ATP, proteins, carbohydrates, lipids, and nucleic acids. Some conditions of the body such as growth, maintenance, and repair could not take place without anabolic reactions. Synthesis reactions in which water is a product are called dehydration (water out) reactions. Decomposition Reactions A decomposition reaction is the reverse of a synthesis reaction—a larger reactant is chemically broken down into two or more smaller products. T...
Read more

About

Hello, everyone. This is a free blog you can learn such lessons on Biology, school lessons, school tips to help you study well at school, the other tips and subjects that help you reach your goal. Thank you.
Read more

BIOLOGICAL MACROMOLECULES

Image
Bio-molecules are a subset of organic molecules. Organic molecules are defined as molecules or compounds that contain both carbon and hydrogen. Most organic molecules are a component of living organisms or have been produced from them. All other types of molecules are inorganic molecules including water, salts (e.g., sodium chloride), acids (e.g., carbonic acid), and bases (e.g., sodium hydroxide). The four major classes of organic biological macro-molecules (bio-molecules) are lipids, carbohydrates, nucleic acids, and proteins.
Read more