【简答题】当激素受体与激素结合后就会变成DNA结合蛋白。糖皮质激素的激素受体改变构象,它可以激活特定的反应基因。遗传学和分子生物学分析表明DNA和激素结合位点占据了糖皮质激素受体C末端一半的确定区域。激素结合可以以下面两种方式的任何一种产生有功能的DNA结合蛋白:①改变受体构象,产生一个DNA结合结构域;②改变受体构象,覆盖一个已存在的DNA结合结构域。 通过糖皮质激素受体的一系列末端缺失的活性比较来研究这...
【单选题】水螅在秋末冬初或环境条件不利时,生殖方式主要是( )。
【简答题】皮球从高处落下,碰到地面被反弹回去。皮球反弹后能不能回到原来的高度?为什么?
【判断题】函数在 时的极限,与函数在 处定义与否无关。
【单选题】下面的短文有5处空白,短文后面有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 Stars in Their Eyes The Scientific American Book of the Cosmos edited by David Levy, Macmillan, £20, ISBN 0333782933 Previous generations of se...
A.
Tegmark fears he may hold the record for the longest time taken to read one book.
B.
In a more positive vein, this is a wonderful collection of essays to dip in and out of if you already have a good overview (概述) of current cosmic understanding.
C.
Levy is an active astronomer and an accomplished writer, so you'd expect him to provide a broad and accurate picture of our current understanding of the cosmos.
D.
Scientific American has attempted to cater to this need by bringing together essays that have appeared in the magazine.
E.
To some extent, these could have been plugged with a glossary (词表). of terms.
F.
Also included are contributions on the world of subatomic particles, the origin of life on the Earth and the possibility of its existence elsewhere.
【简答题】货币层次划分的依据是什么?为什么说科学地划分货币层次具有非常重要的意义?
【简答题】下面程序是将字节地址______单元的内容逐一取出减1,然后再放回原处,如果取出的内容为______,则不要减1,仍将0放回原处。 MOV R7,#10H MOV R1,#30H L00P:CJNE @R1,#00H,NEXT MOV @R1,#00H SJMP NEXT1 NEXT:DEC @R1 NEXT1:INC R1 DJNZ R7,LOOP SJMP $ END
【多选题】某物体沿粗糙斜面上滑,达到最高点后又返回原处,下列分析正确的是 ( ).
【单选题】各地区“打跳” 的风格有异,在称谓上也有差别,又叫__1打歌.跳歌2叠脚舞.叠左脚 3左脚舞.三跺脚 4芦笙舞.阿垂乐