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[主观题]
下列蛋白质中，属于植物细胞壁结构蛋白的是A．钙调蛋白 B．伸展蛋白 C．G蛋白 D．扩张蛋白
下列蛋白质中，属于植物细胞壁结构蛋白的是
A．钙调蛋白 B．伸展蛋白 C．G蛋白 D．扩张蛋白
提问人：网友waluheke
发布时间：2022-01-07
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A、扩张蛋白
B、G蛋白
C、钙调蛋白
D、肌动蛋白
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第2题
将下列大量元素和它们的作用相匹配：
A．组成核酸、蛋白质、激素和辅酶的成分 Ⅰ．硫
B．组成蛋白质、激素和辅酶的成分，不参与核酸组成 Ⅱ．钙
C．组成核酸、磷脂、ATP和某些辅酶的成分 Ⅲ．钾
D．调节蛋白质合成、水平衡，与渗透作用、气孔的开关有关 Ⅳ．磷
E．调节细胞壁稳定性，作为第二信使调节对细胞刺激信号的响应 Ⅴ．氮
F．叶绿素的组成成分 Ⅵ．镁
第6题
病历摘要：患者，男性，50岁，因反复发作性心前区疼痛2年，加剧3h来急诊就诊。2年前劳累后第一次出现心前区闷痛，持续2～5min，休息后或含服硝酸甘油可缓解。此后症状反复发作，3h前晚饭后散步时突感胸骨下段疼痛，呈持续性，休息和含服硝酸甘油不能缓解，伴全身冷汗、头晕、恶心、呕吐而入院。体查：T37℃，P60次／min。R24次／min，BP90／60mmHg，痛苦面容，自动体位，两肺呼吸音清，HR60次／min，律齐。心肌梗死的临床表现可能有以下哪些方面（）。（提示：心电图示Ⅱ、Ⅲ、aVF导联ST段弓背向上抬高0.1～0.3mV，T波直立，V1～V5导联ST段压低0.05～0.2mV。经诊断为急性下壁心肌梗死
A. 50％～81.2％发病前有乏力、胸部不适
B. 疼痛多伴有大汗、烦躁不安及濒死感
C. 体温可升高至38℃左右
D. 疼痛剧烈时常伴恶心、呕吐
E. 心律失常
F . 低血压及休克
G . 白细胞降低
H . 心力衰竭
第8题
On average, American kids aged 3 to 12 spent 29 hours a week in school, eight hours more than they did in 1981. They also did more household work and participated in more of such organized activities as soccer and ballet. Involvement in sports, in particular, rose almost 50% from 1981 to 1997: boys now spend an average of four hours a week playing sports; girls log half that time. All in all, however, children's leisure time dropped from 40% of the day in 1981 to 25%.
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"Children are affected by the same time crunch that affects their parents," says Sandra Hofferth, who headed the recent study of children's timetable. A chief reason, she says, is that more mothers are working outside the home. (Nevertheless, children in both double-income and "male breadwinner" households spent comparable amounts of time interacting with their parents, 19 hours and 22 hours respectively. In contrast, children spent only 9 hours with their single mothers.)
All work and no play could make for some very messed-up kids. "Play is the most powerful way a child explores the world and learns about himself," says T. Berry Brazelton, professor at Harvard Medical School. Unstructured play encourages independent thinking and allows the young to negotiate their relationships with their peers, but kids aged 3 to 12 spent only 12 hours a week engaged in it.
The children sampled spent a quarter of their rapidly decreasing "free time"watching television. But that, believe it or not, was one of the findings parents might regard as good news. If they're spending less time in front of the TV set, however, kids aren't replacing it with reading. Despite efforts to get kids more interested in books, the children spent just over an hour a week reading. Let's face it, who's got the time?
By mentioning "the same time crunch" (Para. 2) Sandra Hofferth means
A．children have little time to play with their parents.
B．children are not taken good care of by their working parents.
C．both parents and children suffer from lack of leisure time.
D．both parents and children have trouble managing their time.
