SAT2生物考试专业词汇：R.

　　SAT2考试是SAT subject test的通常说法，SAT2考试有别于SAT1，它是一种专项考试，考察学生某一科目的能力。下面澳际小编搜集整理了SAT2生物考试专业词汇中以字母R打头的词汇，希望能够帮助大家更好地备考SAT2生物考试。

　　Root(根)

　　The part of a plant beneath the soil; responsible for collecting water and minerals from the soil, storing nutrients, and securing the plant to the ground. Can be fibrous or a taproot.

　　root hair(根须)

　　An outgrowth of a plant root that provides an increased surface area for the absorption of water and dissolved minerals from the soil.

　　Runner(匍行)

　　Slender horizontal stem that can form new plants via specialized nodes.

　　respiratory system(呼吸系统)

　　The organ system responsible for the intake of oxygen and diffusion of that gas into the blood and the elimination of carbon dioxide from the body. Important structures of the system are the pharynx, larynx, trachea, bronchi, bronchioles, and lungs. Alveoli in the lungs are the location of gas exchange with the blood. The movement of the muscular diaphragm allows the lungs to inhale and exhale.

　　Recessive(隐性)

　　Rers to an allele that cannot control the phenotype unless it is the only kind of allele present, as in a homozygote or hemizygote. Also rers to the trait or phenotype produced when only a recessive allele is present. The opposite of recessive is dominant.

　　reproductive isolation(生殖隔离)

　　The inability of individuals within a species to create offspring with members of any other species. The mark of a species is its reproductive isolation from all other species.

　　ribonucl acid (RNA/核糖核酸)

　　One type of nucl acid polymer. RNA nucleotides’ sugars contain one more oxygen atom than DNA nucleotides’ sugars. RNA nucleotides can have the nitrogenous bases adenine, cytosine, guanine, and uracil.

　　Ribosome(核糖体)

　　Organelle responsible for protein synthesis. Ribosomes are located in cytoplasm or endoplasmic reticulum.

　　以上便是澳际小编为大家整理的SAT2生物考试专业词汇中以字母R打头的词汇的相关介绍，希望对大家有所帮助。更多SAT考试相关资料尽在澳际教育网SAT考试频道，澳际小编祝大家都能取得理想的SAT2生物考试成绩!