皮皮学，免费搜题
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【多选题】
皂苷类化合物一般具有的性质为
A.
有明显的熔点
B.
无明显的熔点
C.
甾体皂苷及其皂苷元的旋光度几乎都是左旋
D.
甾体皂苷及其皂苷元的旋光度几乎都是右旋
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从基本表中删除重复元组
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A.
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【多选题】教育信息化的特征是()
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【单选题】How does liver X receptor (LXR) regulate the metabolism of fatty acids, sterols, and glucose?
A.
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B.
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C.
The transcriptional regulators LXR and SREBP therefore work together to achieve and maintain cholesterol homeostasis; SREBPs are activated by low levels of cellular cholesterol, and LXRs are activated by high cholesterol levels.
D.
Regulation by LXRs is complemented by the activity of farnesoid X receptor (FXR), which also forms a heterodimer with RXR, with an effect that is often reciprocal to that of LXR-RXR. Although farnesol is a ligand for this receptor, FXR responds primarily to bile acids. High levels of bile acids can be toxic. FXR, expressed mainly in the intestine, liver, kidney, and adrenal glands, provides essential control of bile acid levels by increasing or decreasing expression of multiple genes.
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【简答题】教育信息化的特征是:
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【简答题】轴对称位移对应的 一定是轴对称的。
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【单选题】真核细胞中对α - 鹅膏蕈碱不敏感的 RNA 合成是( )。
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【多选题】教育信息化的特征表现在
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B.
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【单选题】在真核细胞中，对α-鹅膏蕈碱不敏感的RNA合成是( )。
A.
rRNA
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hnRNA
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snRNA
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【单选题】SQL 中“DELETE FROM 表名”表示( )
A.
从基本表中删除重复元组
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从基本表中删除所有属性
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从数据库中撤消这个基本表
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A.
矿山企业
B.
建筑施工企业
C.
日用化学品生产、经营、存储单位
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E.
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A.
项目的差异
B.
比赛的结构
C.
裁判员的误判
D.
运动员情绪失控
查看完整题目与答案
【多选题】教育信息化的特征是()
A.
数字化
B.
网络化
C.
信息化
D.
虚拟化
E.
智能化
查看完整题目与答案
【单选题】How does liver X receptor (LXR) regulate the metabolism of fatty acids, sterols, and glucose?
A.
LXR is a nuclear transcription factor activated by oxysterol ligands (reflecting high cholesterol levels), which integrates the metabolism of fatty acids, sterols, and glucose. LXRα is expressed primarily in liver, adipose tissue, and macrophages; LXRβ is present in all tissues.
B.
When bound to an oxysterol ligand, LXRs form heterodimers with a second type of nuclear receptor, the retinoid X receptors (RXR), and the LXR-RXR dimer activates transcription from a set of genes, including those for acetyl-CoA carboxylase, the first enzyme in fatty acid synthesis; fatty acid synthase; the cytochrome P-450 enzyme CYP7A1, required for sterol conversion to bile acids; apoproteins that participate in cholesterol transport (apoC-I, apoC-II, apoD, and apoE); the ATP-binding cassette (ABC) transporters ABCA1 and ABCG1, required for reverse cholesterol transport (see below); GLUT4, the insulin-stimulated glucose transporter of muscle and adipose tissue; and an SREBP called SREBP1
C.
The transcriptional regulators LXR and SREBP therefore work together to achieve and maintain cholesterol homeostasis; SREBPs are activated by low levels of cellular cholesterol, and LXRs are activated by high cholesterol levels.
D.
Regulation by LXRs is complemented by the activity of farnesoid X receptor (FXR), which also forms a heterodimer with RXR, with an effect that is often reciprocal to that of LXR-RXR. Although farnesol is a ligand for this receptor, FXR responds primarily to bile acids. High levels of bile acids can be toxic. FXR, expressed mainly in the intestine, liver, kidney, and adrenal glands, provides essential control of bile acid levels by increasing or decreasing expression of multiple genes.
查看完整题目与答案
【简答题】教育信息化的特征是:
查看完整题目与答案