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LARGE CARBON MOLECULES Many carbon compounds are built up from smaller, simpler molecules known as monomers (MAH-ne-mers), such as the ones shown in Figure 3-3. As you can also see in Figure 3-3, monomers can bond to one another to form polymers (PAWL-eh-mer). A polymer is a molecule that consists of repeated, linked units. The units may be identical or structurally related to each other. Large polymers are called macromolecules. There are many types of macromolecules, such as carbohydrates, lipids, proteins and nucleic acids. Monomers link to form polymers through a chemical reaction called a condensation reaction. Each time a monomer is added to a polymer, a water molecule is released. In the condensation reac- tion shown in Figure 3-4, two sugar molecules, glucose and fruc- tose, combine to form the sugar sucrose, which is common table sugar. The two sugar monomers become linked by a C—O—C bridge. In the formation of that bridge, the glucose molecule releases a hydrogen ion, H, and the fructose molecule releases a hydroxide ion, OH. The OH and H ions that are released then combine to produce a water molecule, H2O. In addition to building polymers through condensation reac- tions, living organisms also have to break them down. The break- down of some complex molecules, such as polymers, occurs through a process known as hydrolysis (hie-DRAHL-i-sis). In a hydrolysis reaction, water is used to break down a polymer. The water molecule breaks the bond linking each monomer. Hydrolysis is the reverse of a condensation reaction. The addition of water to some complex molecules, including polymers, under certain con- ditions can break the bonds that hold them together. For example, in Figure 3-4 reversing the reaction will result in sucrose breaking down into fructose and glucose. 2H2O Monomers Polymer C C O H OH C OH H CH2OH C H CH2OH C HO H C O H C OH H C CH2OH H C H OH O Sucrose C C O H OH C OH H CH2OH C H CH2OH C HO H C OH OH H C OH H C CH2OH H C H OH O Glucose Fructose H2O The condensation reaction below shows how glucose links with fructose to form sucrose. One water molecule is produced each time two monomers form a covalent bond. FIGURE 3-4 monomer from the Greek mono, meaning “single or alone,” and meros, meaning “a part” Word Roots and Origins A polymer is the result of bonding between monomers. In this example, each monomer is a six-sided carbon ring. The starch in potatoes is an example of a molecule that is a polymer. FIGURE 3-3 Copyright © by Holt, Rinehart and Winston. All rights reserved. 54 CHAPTER 3 ENERGY CURRENCY Life processes require a constant supply of energy. This energy is available to cells in the form of certain compounds that store a large amount of energy in their overall structure. One of these com- pounds is adenosine (uh-DEN-uh-SEEN) triphosphate, more commonly referred to by its abbreviation, ATP. The left side of Figure 3-5 shows a simplified ATP molecule struc- ture. The 5-carbon sugar, ribose, is represented by the blue carbon ring. The nitrogen-containing compound, adenine, is represented by the 2 orange rings. The three linked phosphate groups, —PO4 , are represented by the blue circles with a “P.” The phospate groups are attached to each other by covalent bonds. The covalent bonds between the phosphate groups are more unstable than the other bonds in the ATP molecule because the phosphate groups are close together and have negative charges. Thus, the negative charges make the bonds easier to break. When a bond between the phosphate groups is broken, energy is released. This hydrolysis of ATP is used by the cell to provide the energy needed to drive the chemical reactions that enable an organism to function.

Spectacular - Spektakulär Unexpected - Oväntad A moment of truce - Ett vapenstillestånd Push the limits - Tänja på gränserna Free climber - Fria klättrare Descriptions - Beskrivningar Get a rush from - Få en kick från End up face to face with sharks - Sluta ansikte mot ansikte med hajar Crawling - Krypande Chalk powder - Kritpulver Pouch around your waist - Påse runt din midja On purpose - Med avsikt Seek thrills - Söka spänningar Accomplish my dreams - Uppnå mina drömmar Comes at a cost - Kommer med ett pris Permission - Tillstånd Achievements - Framgångar Fallen from heights - Fallit från höjder Fallen into a coma - Hamnat i koma Stiches - Stygn Target - Mål Reaching his goal - Nå sitt mål Retell - Berätta om Ordinary people - Vanliga människor Uncommon - Ovanlig On American soil - På amerikansk mark Hijacked - Kapat The outcome - Resultatet The public - Allmänheten Structural engineer - Byggnadsingenjör Port - Hamn Witnessing - Vittna Make it down the stairwell - Ta sig ner för trapphuset A roaring sound - Ett brölande ljud Take cover - Söka skydd Crouched down - Hopkrupen The walls cracked open - Väggarna sprack upp Underneath - Under Fall unconscious - Förlora medvetandet In the rubble - I rasmassorna Unaware of - Omedveten om Devastating moment in history - Förödande ögonblick i historien The mobile network is down - Mobilnätverket ligger nere Commit crimes - Begå brott Throughout history - Genom historien Path - Väg Whiny voice - Gnällig röst Wearing him down - Slita ner honom Long for - Längta efter Thumping - Dunkande Spiked with a deadly dose of poison - Spetsad med en dödlig dos gift Gone through with it - Genomfört det Constant nagging - Ständigt gnäll Infidelity - Otrohet Carved - Skuren Perform on the big stages - Uppträda på de stora scenerna Unrealistic demands - Orealistiska krav Something fishy is going on - Något skumt pågår Offered a reward - Erbjöd en belöning Downfall - Fall Accomplice - Medbrottsling Undoubtedly - Utan tvekan Board a ship - Stiga ombord på ett skepp Suspense - Spänning Trip on a wire - Snubbla på en tråd Invention - Uppfinning Customs officer - Tulltjänsteman Extraordinary - Extraordinär Nearly - Nästan The entire population - Hela befolkningen Cease to exist - Upphöra att existera Great courage - Stort mod Goodwill - God vilja A little bit of humanity - Lite mänsklighet In the midst - Mitt ibland Lose faith in - Förlora tro på Snowflakes - Snöflingor Turn the doorknob - Vrida dörrknoppen Shelter - Skydd Gesture towards the cabin - Gesta mot stugan Pale - Blek Commotion - Uppståndelse Medic - Sjukvårdare Ease up the tension - Minska spänningen Extend his hand - Sträcka ut sin hand Painkillers - Smärtstillande Supper - Kvällsmat Foolish - Dum Establish - Etablera Drop a nuclear bomb - Släppa en kärnvapenbomb The Great Plague - Den stora pesten Civil rights - Medborgerliga rättigheter Underline - Understryka Keen on - Angelägen om

Bathtub bồn tắm bed giường bookcase giá sách chair ghế closet tủ quần áo computer máy tính cushions gối tựa desk bàn làm việc dishwasher máy rửa chén lamp đèn bàn / đèn ngủ mirror gương refrigerator tủ lạnh rug thảm nhỏ sofa ghế sô-pha stove bếp nấu TV the nice view quang cảnh đẹp the unusual location vị trí đặc biệt the school nearby trường học gần đó the quiet location khu vực yên tĩnh the fishing nearby khu câu cá gần đókhu câu cá gần đó the fresh air không khí trong lành the large rooms các phòng rộng rãi the friendly neighbors hàng xóm thân thiện the shopping nearby khu mua sắm gần đó the low cost chi phí thấp the freedom to travel sự tự do đi lại

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