皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【判断题】
报检人在填写报检日期时,应按检验检疫机构受理报检的日期来填写。(    )
A.
正确
B.
错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【单选题】关于霍乱,下述错误的是
A.
为烈性传染病
B.
人类是霍乱弧菌的唯一易感者
C.
经消化道传播
D.
病后可获得短暂免疫力
E.
免疫力主要是SIgA的作用
【单选题】我国劳动保险条例对退休待遇的年龄规定为( )
A.
男年满60岁,女职员年满55岁
B.
男年满60岁,女职员年满50岁
C.
男年满55岁,女职员年满55岁
D.
男年满60岁,女职员年满50岁
【单选题】《献血法》规定,公民自愿献血的年龄为
A.
男18至60周岁,女16至60周岁
B.
男16至60周岁,女18至60周岁
C.
男18至60周岁,女18至55周岁
D.
男18至55周岁,女18至55周岁
E.
男18至55周岁,女16至60周岁
【单选题】Photoshop中最常用的有损压缩格式是?
A.
JPEG
B.
PSD
C.
TIFF
D.
PDF
【简答题】有关proe的问题学习proe。要注意哪些事情?
【判断题】越是有知识、有文化,规则意识便越强。
A.
正确
B.
错误
【多选题】How do receptor tyrosine kinases (RTKs) activate Ras?
A.
The Ras protein is a member of a large family of small GTP-binding proteins, often called monomeric GTPases to distinguish them from the trimeric G proteins. Ras resembles the α subunit of a G protein and functions as a molecular switch in much the same way.
B.
It cycles between two distinct conformational states—active when GTP is bound and inactive when GDP is bound. Interaction with an activating protein called Ras-GEF encourages Ras to exchange its GDP for GTP, thus switching Ras to its activated state; after a delay, Ras is switched off by a GAP called Ras-GAP, which promotes the hydrolysis of its bound GTP to GDP.
C.
In its active state, Ras initiates a phosphorylation cascade in which a series of serine/threonine kinases phosphorylate and activate one another in sequence, like an intracellular game of dominoes. This relay system, which carries the signal from the plasma membrane to the nucleus, includes a three-kinase module called the MAP-kinase signaling module, in honor of the final enzyme in the chain, the mitogen-activated protein kinase, or MAP kinase.
D.
In this pathway, MAP kinase is phosphorylated and activated by an enzyme called, logically enough, MAP kinase kinase. This protein is itself switched on by a MAP kinase kinase kinase (which is activated by Ras). At the end of the MAP-kinase cascade, MAP kinase phosphorylates various effector proteins, including certain transcription regulators, altering their ability to control gene transcription. The resulting change in the pattern of gene expression may stimulate cell proliferation, promote cell survival, or induce cell differentiation: the precise outcome will depend on which other genes are active in the cell and what other signals the cell receives.
【单选题】农村集体经济统计制度规定的男女劳动力的年龄上限分别是( )。
A.
男60岁、女55岁
B.
男60岁、女54岁
C.
男59岁、女55岁
D.
男59岁、女54岁
【多选题】How do receptor tyrosine kinases (RTKs) activate the PI-3-kinase–Akt signaling pathway?
A.
An extracellular survival signal, such as IGF, activates an RTK, which recruits and activates PI 3-kinase. PI 3-kinase then phosphorylates an inositol phospholipid that is embedded in the cytosolic side of the plasma membrane.
B.
The resulting phosphorylated inositol phospholipid attracts intracellular signaling proteins that have a special domain that recognizes it.
C.
One of these signaling proteins, Akt, is a protein kinase that is activated at the membrane by phosphorylation mediated by two other protein kinases (here called protein kinases 1 and 2); protein kinase 1 is also recruited by the phosphorylated lipid docking sites.
D.
Once activated, Akt is released from the plasma membrane and phosphorylates various downstream proteins on specific serines and threonines.
【单选题】流线型平衡舵在舵叶上均开有由钢管构成的绳孔或在尾端上开有凹槽,其目的是__。
A.
便于系固物件
B.
便于舵拆卸与复装时吊起
C.
便于与舵承舵杆连接
D.
便于试验工作
相关题目:
【多选题】How do receptor tyrosine kinases (RTKs) activate Ras?
A.
The Ras protein is a member of a large family of small GTP-binding proteins, often called monomeric GTPases to distinguish them from the trimeric G proteins. Ras resembles the α subunit of a G protein and functions as a molecular switch in much the same way.
B.
It cycles between two distinct conformational states—active when GTP is bound and inactive when GDP is bound. Interaction with an activating protein called Ras-GEF encourages Ras to exchange its GDP for GTP, thus switching Ras to its activated state; after a delay, Ras is switched off by a GAP called Ras-GAP, which promotes the hydrolysis of its bound GTP to GDP.
C.
In its active state, Ras initiates a phosphorylation cascade in which a series of serine/threonine kinases phosphorylate and activate one another in sequence, like an intracellular game of dominoes. This relay system, which carries the signal from the plasma membrane to the nucleus, includes a three-kinase module called the MAP-kinase signaling module, in honor of the final enzyme in the chain, the mitogen-activated protein kinase, or MAP kinase.
D.
In this pathway, MAP kinase is phosphorylated and activated by an enzyme called, logically enough, MAP kinase kinase. This protein is itself switched on by a MAP kinase kinase kinase (which is activated by Ras). At the end of the MAP-kinase cascade, MAP kinase phosphorylates various effector proteins, including certain transcription regulators, altering their ability to control gene transcription. The resulting change in the pattern of gene expression may stimulate cell proliferation, promote cell survival, or induce cell differentiation: the precise outcome will depend on which other genes are active in the cell and what other signals the cell receives.
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题