单选题大鼠出生后饲以去脂膳食，结果将引起下列哪种脂质缺乏( )(1999年)

单选题蛋白质分子的最大吸收峰在哪一波长附近

单选题A．cGMP依赖的蛋白激酶 B．酪氨酸蛋白激酶 C．cAMt依赖的蛋白激酶 D．Ca 2+ 磷脂依赖的蛋白激酶 E．钙调蛋白依赖的蛋白激酶

单选题肝受损时，血中蛋白质的主要改变是

单选题第二信使的化学本质是

单选题A．6-巯基嘌呤B．甲氨蝶呤C．氮杂丝氨酸D．别嘌呤醇

单选题在鸟氨酸循环中，直接生成尿素的中间产物是( )(2010年)

单选题维生素D的主要生化作用是

单选题A．参与嘌呤核苷酸从头合成B．参与嘌呤核苷酸补救合成C．参与嘧啶核苷酸从头合成D．参与嘧啶核苷酸分解E．参与嘌呤核苷酸分解

单选题LDL的生成部位为

单选题A．尿素B．核苷酸C．尿酸D．氨基酸E．γ－氨基异丁酸

单选题关于蛋白质变性，下列说法哪项错误

单选题与线粒体内膜结合得最疏松的细胞色素是

单选题经分解代谢可产生一碳单位的氨基酸是( )(2011年)

单选题在真核生物复制起始和延长中起关键作用

单选题Did you ever have someone's name on the tip of your tongue and yet you were unable to recall it? (1) this happens again, do no (2) to recall it. Do something (3) for a couple of minutes, (4) the name may come into your head. The name is there since you have met (5) person and his name. It (6) has to be dug out. The initial effort to recall (7) the mind for operation, but it is the subconscious (8) that go to work to dig up a (9) memory. Forcing yourself to recall (10) never helps because it doesn't (11) your memory；it only tightens it. Students find the preparatory method help (12) examinations. They read over the questions (13) trying to answer any of them. (14) they answer first the ones (15) which they are most confident. Meanwhile, deeper mental activities in the subconscious mind are taking (16) ; work is being done on the (17) difficult questions. By the time the easier questions are answered, answers (18) the more difficult ones will usually begin to (19) into consciousness. It is often (20) a question of waiting for recall to come to the memory.

单选题脑中氨的主要去路

单选题蛋白质生物合成过程中。肽链的延长与下列哪种因素无关?

单选题关于维生素的活性形式，不正确的是

单选题同一种哺乳细胞中，下列哪种情况是对的