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【单选题】
I admit I am a complete fool about cats, who, for some reason I don't understand, fail to return my admiration. I will wait minutes for cars to pass so that I can cross the road to address a black and white cat at ease in sunshine on a low wall, either to watch the tip of a frightened tail disappear under a neighboring gate or to be met with the most violent cat curses or, while my hand moves gently over the smooth shining fur, to be bitten or scratched or attacked in both ways at the same time. It makes no difference: I continue my journey with my respect increased. After all, the wisest men of one of the oldest civilizations worshipped the noble cat so why should I be ashamed of following their example? I have sometimes stayed long enough in one place to be owned by a cat and it is on those occasions that I at last feel sympathy with parents who cannot control their children. I have the firmest belief in discipline, especially for the cat who adopts me and is kind enough to allow me to share her home and provide her with food. She will have a comfortable basket and not sit on any furniture she will come when called or have no supper and she will at all times behave towards me with the respect I show towards her. And then what happens? She refuses even to consider the basket, and, as soon as my back is turned, settles on my favorite chair, daring me to move her on my return. At some unexpected moment after I have sat down, she springs suddenly on to my knees and delightedly ruins my stockings with her claws, complaining angrily, even painfully with the sharpest of teeth, if I bend down to pick something up. I dare not rise to change the television program, however much I dislike it, and she watches dreamily the moving shadows on the screen. She comes not to my call, but when she is ready, hours later, and I am so relieved to see her that her supper is increased in amount. When put out at night (with fierce disapproval) she waits till I am asleep and then cries noisily at my bedroom to come in. An hour later she cries even more noisily at the bedroom door to be let out again. If I go away on holiday, a neighbor feeds her, who reports on my return on her sweetness, her obedience and perfect behavior. I am the only one that she delights in defying. Dogs are pleasant animals, friendly, faithful and intelligent. Dogs have proper respect for the human race. You know where you are with a dog never with a cat, who will be selfish, vain, ungrateful and quite unreasonable. But that's just it. Who wants to know where he is with any living thing? It is the free, the strange creature of grace and beauty, the independent and unknown, that attracts, not the worthy, respectful, dependable slave. What is the writer's feeling for cats?
A.
She gives them unreturned worship.
B.
They are a combination of annoyance and intense admiration.
C.
She is quite fond of them.
D.
She is ashamed of being their slave.
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【判断题】蛋白质分子中半胱氨酸残基彼此接近生成二硫键,主要是由于分子内的非共价相互作用决定的。 ( )
A.
正确
B.
错误
【单选题】()是蛋白质分子中的主要共价键。
A.
离子键
B.
共价键
C.
肽键
D.
氢键
【单选题】健康成年男性静息状态下,心输出量约为
A.
1~2L/min
B.
2~3L/min
C.
4~6L/min
D.
6~8L/min
E.
8~10L/min
【单选题】取样的离散音频要转化为计算机能够表示的数据范围,这个过程称为( )。
A.
采样
B.
量化
C.
编码
D.
模拟
【单选题】取样的离散音频要转化为计算机能够表示的数据范围,这个过程称为( )。
A.
量化
B.
采样
C.
存储
D.
编码
【简答题】下列胺类化合物中,具有碱性的是 ;具有酸性的是 ;中性的是 。 A :RSO 2 NHR;B:(C 6 H 5 ) 2 NR; C: C 6 H 5 CONR 2
【单选题】健康成年男性静息状态下,心输出量约为
A.
2-3L/min
B.
4-6L/min
C.
7-8L/min
D.
9-10L/min
【单选题】下列关于蛋白质分子三级结构的描述中哪一项是不正确的?
A.
天然蛋白质分子都具有三级结构
B.
具有三级结构的多肽链都具有生物学活性
C.
三级结构的稳定性主要依靠非共价键的作用
D.
亲水基团聚集在三级结构的表面
【单选题】蛋白质二级结构中主要的化学键是
A.
共价键
B.
氢键
C.
离子键
D.
范德华力
E.
疏水结构
【多选题】关于蛋白质分子中的疏水键的叙述正确的是
A.
是氨基酸之间的连接键
B.
是在氨基酸侧链和蛋白质表面水分子之间形成
C.
属于非共价键
D.
是在氨基酸非极性侧链之间形成
E.
疏水键是维持蛋白质三级结构的主要次级键
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