诱发基因突变的因素有物理因素、化学因素和生物因素,下列诱因中,属于生物因素的是()

题型:单项选择题

问题:

诱发基因突变的因素有物理因素、化学因素和生物因素,下列诱因中,属于生物因素的是()

A.病毒感染

B.紫外线照射

C.秋水仙素处理

D.摄入亚硝酸盐

考点:高中生物基因重组与基因突变基因重组与基因突变题库
题型:单项选择题

属于内分泌器官的是()

A.肝

B.胸腺

C.肾

D.胰腺

E.松果体

题型:单项选择题

下列各项内容不属于施工成本计划的依据的是()

A、设计概算

B、合同报价书

C、已签订的工程合同

D、分包合同

题型:单项选择题

如图2-22所示,一定量的理想气体从体积V膨胀到K2,经历的过程分别为:a→b为等压过程,a→c为等温过程,a→d为绝热过程,其中吸热最多的过程是()。

A.等压过程

B.等温过程

C.绝热过程

D.三个过程吸收的热量相同

题型:单项选择题

控制工程分包风险措施有()。

A、加强法律法规的学习,强化工程施工中防范分包的法律风险意识

B、选择盈利多的分包单位

C、严格依法经营,切实加强施工分包合同管理

D、完善企业规章制度,依法规范工程分包中的各个环节

E、抓总包方的廉政建设

题型:单项选择题

What’s your earliest memory Do you remember learning to walk The birth of a sibling Nursery school Adults rarely remember events from much before kindergarten, just as children younger than 3 or 4 seldom recall any specific experiences (as distinct from general knowledge). Psychologists have floated all sorts of explanations for this “childhood amnesia”. The reductionists appealed to the neurological, arguing that the hippocampus, the brain region responsible for forming memories, doesn’t mature until about the age of 2. But the reigning theory holds that since adults do not think like children, they cannot access childhood memories. Adults are struck with grown-up “schema”, the bare bones of narratives. (46)When they riffle through the mental filing cabinet in search of fragments of childhood memories to hang on this narrative skeleton, according to this theory, they don’t find any that fit. It’s like trying to find the French word in an English index.
Now psychologist Katherine Nelson of the City University of New York offers a new explanation for childhood amnesia. (47)She argues that children don’t even form lasting, long-term memories of personal experiences until they learn to use someone else’s description of those experiences to turn their own short-term, fleeting recollections into permanent memories. In other words, children have to talk about their experiences and hear others talk about them — hear Mom recount that days’ trip to the dinosaur museum, hear Dad re- member aloud their trip to the amusement park.
Why should memory depend so heavily on narrative Nelson marshals evidence that the mind structures remembrances that way. (48)Children whose mothers talk about the day’s activities as they wind down toward bedtime, for instance, remember more of the day’s special events than do children whose mothers don’t offer this novelistic framework. Talking about an event in a narrative way helps a child remember it. (49)And learning to structure memories as a long-running narrative, Nelson suggests, is the key to a permanent “autobiographical memory”, the specific remembrances that form one’s life story. (What you had for lunch yesterday isn’t part of it; what you ate on your first date with your future spouse may be.)
Language, of course, is the key to such a narrative. Children learn to engage in talk about the past. The establishment of these memories is related to the experience of talking to other people about them. (50)In particular, a child must recognize that a retelling — of that museum trip, say — is just the trip itself in another medium, that of speech rather than experience. That doesn’t happen until the child is perhaps four or five. By the time she’s ready for kindergarten she’ll remember all sorts of things. And she may even, by then, have learned’ not to blurt them out in public.

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