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Glucosamine - a glucose1 or galactose molecule2 with an amine group attached. see also glucuronic acid.
Glucose - a molecule of great importance to life as it provides a ready source of energy for both plant and animal cells. Glucose can only be formed in plants with the aid of sunlight. This process of photosynthesis3 sustains all animal life on earth. The glucose molecule is formed by a ring of a six carbon atoms. It is progressively broken down in a process called glycolysis during both aerobic4 and anaerobic5 respiration6 into ATP
Glucuronic acid- a glucose molecule with an acid carboxyl group. One of the two molecules7 which makes up the repeating disaccharide unit of glycosaminoglycans other molecule is a glucosamine.
Glycine - one of 20 amino acids commonly found in proteins.
Glycogen - a polysaccharide made up of repeated glucose units. Animals make glycogen and store it in liver and muscles.
Glycolysis - the breakdown8 of glucose in series of metabolic9 steps. Energy in the form of ATP is released even if there is no oxygen available as in anaerobic respiration. In the presence of oxygen as in aerobic respiration the breakdown is more complete and yields more energy.
Glycoproteins - are proteins which have many sugar molecules attached to them. They are an important component10 of saliva11 where they provide lubrication for the teeth. They also have a wide range of other functions in connective tissues. Examples are fibronectin, osteonectin, osteopontin and interferon. Glycoproteins are also found in cell membranes13 where they define part of the cells identity. The four major blood groups are defined by glycoproteins on the cell membranes of red blood cells.
Glycosaminoglycans (GAGs) - large to huge molecules of the connective tissue matrix, made up of repeating disaccharide units linked to a protein core. The disaccharide units are made of glucosamine and glucuronic acid. The position of a sulphate molecule on the glucosamine determines the type of GAG.
Golgi apparatus14 - a cell organelle which is part of the inner cell membrane12. It collects and stores the products from the endoplasmic reticulum. It is prominent in actively15 secreting16 cells.
Gomphosis - a form of tooth attachment17 in which the root is help in a bony socket18 by a fibrous ligament.
Gonial angle - the angle made by the posterior part of the ramus and the lower border of the mandible.
Ground substance - a jelly-like substance which surrounds cells and provides, with fibre, a supportive matrix around each cell. It consists of water and huge molecules which helps transport nutrients19 to cells and carries away cell products.
1 glucose | |
n.葡萄糖 | |
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2 molecule | |
n.分子,克分子 | |
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3 photosynthesis | |
n.光合作用 | |
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4 aerobic | |
adj.需氧的,增氧健身法的,有氧的 | |
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5 anaerobic | |
adj.厌氧的 | |
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6 respiration | |
n.呼吸作用;一次呼吸;植物光合作用 | |
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7 molecules | |
分子( molecule的名词复数 ) | |
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8 breakdown | |
n.垮,衰竭;损坏,故障,倒塌 | |
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9 metabolic | |
adj.新陈代谢的 | |
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10 component | |
n.组成部分,成分,元件;adj.组成的,合成的 | |
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11 saliva | |
n.唾液,口水 | |
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12 membrane | |
n.薄膜,膜皮,羊皮纸 | |
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13 membranes | |
n.(动物或植物体内的)薄膜( membrane的名词复数 );隔膜;(可起防水、防风等作用的)膜状物 | |
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14 apparatus | |
n.装置,器械;器具,设备 | |
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15 actively | |
adv.积极地,勤奋地 | |
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16 secreting | |
v.(尤指动物或植物器官)分泌( secrete的现在分词 );隐匿,隐藏 | |
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17 attachment | |
n.附属物,附件;依恋;依附 | |
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18 socket | |
n.窝,穴,孔,插座,插口 | |
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19 nutrients | |
n.(食品或化学品)营养物,营养品( nutrient的名词复数 ) | |
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