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【单选题】
下面对术后镇痛常用给药方式的叙述中不正确的是( )。A.
PCA的主要优点是能够提高镇痛效果和患者满意度，节省用药，不良反应较少。根据给药途径不同可分为患者自控静脉镇痛(PCIA)、患者自控硬膜外镇痛(PCEA)、患者自控皮下镇痛(PCSA)、患者自控外神经阻滞镇痛和患者自控气管内镇痛、患者自控鼻腔镇痛等
B.
间断给药：根据半衰期和作用时间间断给药，缺点是镇痛不连续，药效减弱时，会给患者带来痛苦；如果采用肌内注射方法，患者将更加难以接受
C.
患者自控镇痛(PCA)：使用多功能、具安全控制系统的微电脑输液泵。患者通过按压给药按钮自行给药，来满足个人镇痛需要
D.
连续给药：使用微量泵连续经静脉、皮下和椎管内给药，镇痛效果连续，满意度高；缺点是如药量设置不当，久输后可能药物蓄积而出现不良反应
E.
超前镇痛：在伤害性冲动产生之前给予镇痛药物，阻断伤害性刺激后神经和神经元过度兴奋和过度释放，从而减低疼痛强度
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【单选题】A polypeptide has the amino acid sequence glycine – arginine – lysine – serine. The table gives possible tRNA anticodons for each amino acid. Which sequence of bases on DNA would code for the polypept...
A.
CCACGCAAGAGC
B.
CCTTCCTTCTCG
C.
GGAAGGAAAAGC
D.
GGTTGGTTGTGC
【单选题】Release of amino acid nitrogen and NH4+ is an important step in generating precursors for the urea cycle. Which statement best describes this release of amino acid nitrogen as NH4+ from amino acids?
A.
NH4+ freely diffuses across membranes.
B.
Glutamate deamination by oxidation is readily reversible.
C.
Serine deamination to pyruvate is readily reversible.
D.
Glutamine deamination to glutamate is readily reversible.
E.
NH3 cannot freely diffuse across membranes.
【简答题】画像;(对某事物的)描绘
【单选题】The amino acid pool allows for constant substrates to be available for numerous bodily uses. Which statement below best describes this amino acid pool?
A.
Approximately 80% of the body ’ s total protein is in the amino acid pool.
B.
Dietary proteins constitute most of the amino acid pool.
C.
The concentration of free amino acids is as rigidly controlled as blood glucose levels.
D.
The synthesis of new protein is the major use of amino acids in the amino acid pool.
E.
Changes in the rate of protein synthesis and degradation occur within seconds to minutes.
【简答题】画像,(对某事物的)描绘 n.
【简答题】画像,(对某事物)的描述
【单选题】An individual has been shown to have a deficiency in an intestinal epithelial cell amino acid transport system for leucine. However, the individual shows no symptoms of amino acid deficiency. This cou...
A.
The body synthesizes leucine to compensate for the transport defect.
B.
The kidney reabsorbs leucine and sends it to other tissues.
C.
There are multiple transport systems for leucine.
D.
Isoleucine takes the place of leucine in proteins.
E.
Leucine is not necessary for bulk protein synthesis.
【单选题】An individual has been diagnosed with Hartnup disease and is experiencing symptoms consistent with niacin deficiency. In this patient, which amino acid is no longer able to “ spare ” the dietary requi...
A.
Alanine
B.
Tryptophan
C.
Glutamine
D.
Leucine
E.
Methionine
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