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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...
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Membrane Lipids

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The plasma membrane contains several different types of lipids including phospholipids, cholesterol, and glycolipids. The plasma membrane is composed of two layers of phospholipid molecules with scattered embedded protein and cholesterol molecules. The hydrophilic heads of the phospholipids face the extracellular and intracellular fluids, and the hydrophobic tails form the internal layer of the membrane. Cholesterol and proteins scattered throughout and associated with its surface. Phospholipids In a cell membrane, phospholipids are arranged in two layers - lipid bilayer, a double layer of phospholipid molecules, because they have a polar head and a nonpolar (uncharged) tail. The polar heads are attracted to water molecules, so they are also called hydrophilic (water-loving) heads. The polar, hydrophilic heads are exposed to the aqueous extracellular and intracellular fluids of the cell. The tails of the phospholipids are nonpolar and are not attracted to water molecules,...
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ភ្នាសប្លាស្មា-Plasma Membrane

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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 mov...
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Test 1

Choose the correct answer bellow. _____________ are fundamental building blocks of all matter. atom cells molecules organisms The smallest unit of life is______________. atom molecule cell organism A process by which an organism produces offspring is called_________________. reproduction homeostasis inheritance development The state of maintaining a constant internal environment within an organism is called__________________. reproduction life imbalance homeostasis The term__________________ refer to the sum of all chemical reaction in the body. stimulus responsiveness reproduction metabolism Substances that dissolve in water include all of the following except_______________________. glucose lipids proteins salts Answer the following questions. What properties are common to all living things? What is a cell? What are the components of a triglyceride? What are some of the different between RNA and DNA? Which properties of water enable...
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Human Digestive System

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1 Anatomy of the Digestive System Digestive System The digestive system consists of a digestive tube and its associated accessory digestive organs. The digestive system includes the oral cavity, pharynx, esophagus, stomach, small intestine, large intestine, and anus. Accessory digestive organs, such as the salivary glands, liver, gallbladder, and pancreas, are connected to the digestive tract.
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Chemical Reactions and Energy

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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...
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Back Pain

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Low back pain can result in injury poor posture and being overweight or lack of fitness; it is the primary cause of missed work and the second most common neurological affliction in the United States. In addition to chronic pain, a low back injury is often accompanied by muscle spasms which are spontaneous painful, uncontrolled muscle contractions. A few changes may help prevent more spasms and reduce pain. Patients should sit and stand up straight: use a low back support when sitting; lose weight; exercise, especially the back and abdominal muscles; and try to sleep on their side on a firm mattress. If lifestyle changes are not sufficient, treatment with muscle relaxants. anti-inflammatory drugs. or pain medication may be necessary. I ow back pain can result from injury, poor posture, being over.
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