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【单选题】
丙炔和2分子HCl加成的主要产物是
A.
1,1-二氯丙烷
B.
1,2-二氯丙烷
C.
2,2-二氯丙烷
D.
2,3-二氯丙烷
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【单选题】工化 2.4.6 同温同体积下,在 A 和 B 混合气体中,若混合气体总压力为 101.3 kPa , B 的摩尔分数为 0.200 ,则 A 的分压为 ( )
A.
20.2 kPa
B.
81.0 kPa
C.
85.1 kPa
D.
101.3 kPa
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【单选题】下列哪种方法不能调换图层:
A.
特性
B.
特性匹配
C.
帮助
D.
绘图
查看完整题目与答案
【单选题】What will happen if the amino acid sequence is used directly for primer designing?
A.
There would be certainty because the genetic code is unique for each amino acid
B.
There would be uncertainty as the genetic code is degenerate and none of the amino acid is having a unique code
C.
There would be uncertainty as the genetic code is degenerate but some of the amino acids such as methionine are having a unique codon
D.
The amount of uncertainty or certainty is a matter of chance
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【多选题】What is the biological and pharmaceutical role of D-amino acids?
A.
Although D-amino acids do not generally occur in proteins, they do serve some special functions in the structure of bacterial cell walls and peptide antibiotics.
B.
Bacterial peptidoglycans contain both D-alanine and D-glutamate. D-Amino acids arise directly from the L isomers by the action of amino acid racemases, which have pyridoxal phosphate as cofactor. Amino acid racemization is uniquely important to bacterial metabolism, and enzymes such as alanine racemase are prime targets for pharmaceutical agents.
C.
One such agent, L-fluoroalanine, is being tested as an antibacterial drug. Another, cycloserine, is used to treat tuberculosis.
D.
Because these inhibitors also affect some PLP-requiring human enzymes, however, they have potentially undesirable side effects.
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【单选题】根据船舶吨税法律制度的规定，下列船舶中，不予免征船舶吨税的是（ ）。
A.
捕捞渔船
B.
非机动驳船
C.
养殖渔船
D.
军队专用船舶
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【单选题】What has a significant position in the growth of human body tissues?
A.
Essential amino acids.
B.
Non-essential amino acids.
C.
Fat.
D.
Proteins.
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【简答题】下列程序段的输出结果是 _______ 。 void main() { int a=1,b=1,c=1; a+=b; b+=c; c+=a; printf("(1)%d\n",a>b?a:b); printf("(2)%d\n",a>c?a--:c++); (a>=b>=c)?printf("AA"):printf("CC"); printf("\na=%d,b=%d,c=%d\n",a...
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【单选题】下列程序段的输出结果是()。 int aa[4][4]={{1,2,3,4},{5,6,7,8},{3,9,10,2},{4,2,9,6}}; inti,s=0; for(i=0;i<4;i++) s+=aa[i][1]; printf("%d\n",s);
A.
11
B.
19
C.
13
D.
20
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【简答题】下列程序段的输出结果是()。int aa[4][4]={{1,2,3,4},{5,6,7,8},{3,9,10,2},{4,2,9,6}};int i,s=0;for(i=0;i<4;i++)s+=aa[i][1];printf("%d\n",s);A. 11 B. 19 C. 13 D. 20
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【单选题】下列哪种方法不能调换图层
A.
特性
B.
特性匹配
C.
帮助
查看完整题目与答案
相关题目：
【单选题】工化 2.4.6 同温同体积下,在 A 和 B 混合气体中,若混合气体总压力为 101.3 kPa , B 的摩尔分数为 0.200 ,则 A 的分压为 ( )
A.
20.2 kPa
B.
81.0 kPa
C.
85.1 kPa
D.
101.3 kPa
查看完整题目与答案
【单选题】下列哪种方法不能调换图层:
A.
特性
B.
特性匹配
C.
帮助
D.
绘图
查看完整题目与答案
【单选题】What will happen if the amino acid sequence is used directly for primer designing?
A.
There would be certainty because the genetic code is unique for each amino acid
B.
There would be uncertainty as the genetic code is degenerate and none of the amino acid is having a unique code
C.
There would be uncertainty as the genetic code is degenerate but some of the amino acids such as methionine are having a unique codon
D.
The amount of uncertainty or certainty is a matter of chance
查看完整题目与答案
【多选题】What is the biological and pharmaceutical role of D-amino acids?
A.
Although D-amino acids do not generally occur in proteins, they do serve some special functions in the structure of bacterial cell walls and peptide antibiotics.
B.
Bacterial peptidoglycans contain both D-alanine and D-glutamate. D-Amino acids arise directly from the L isomers by the action of amino acid racemases, which have pyridoxal phosphate as cofactor. Amino acid racemization is uniquely important to bacterial metabolism, and enzymes such as alanine racemase are prime targets for pharmaceutical agents.
C.
One such agent, L-fluoroalanine, is being tested as an antibacterial drug. Another, cycloserine, is used to treat tuberculosis.
D.
Because these inhibitors also affect some PLP-requiring human enzymes, however, they have potentially undesirable side effects.
查看完整题目与答案
【单选题】根据船舶吨税法律制度的规定，下列船舶中，不予免征船舶吨税的是（ ）。
A.
捕捞渔船
B.
非机动驳船
C.
养殖渔船
D.
军队专用船舶
查看完整题目与答案
【单选题】What has a significant position in the growth of human body tissues?
A.
Essential amino acids.
B.
Non-essential amino acids.
C.
Fat.
D.
Proteins.
查看完整题目与答案
【简答题】下列程序段的输出结果是 _______ 。 void main() { int a=1,b=1,c=1; a+=b; b+=c; c+=a; printf("(1)%d\n",a>b?a:b); printf("(2)%d\n",a>c?a--:c++); (a>=b>=c)?printf("AA"):printf("CC"); printf("\na=%d,b=%d,c=%d\n",a...
查看完整题目与答案
【单选题】下列程序段的输出结果是()。 int aa[4][4]={{1,2,3,4},{5,6,7,8},{3,9,10,2},{4,2,9,6}}; inti,s=0; for(i=0;i<4;i++) s+=aa[i][1]; printf("%d\n",s);
A.
11
B.
19
C.
13
D.
20
查看完整题目与答案
【简答题】下列程序段的输出结果是()。int aa[4][4]={{1,2,3,4},{5,6,7,8},{3,9,10,2},{4,2,9,6}};int i,s=0;for(i=0;i<4;i++)s+=aa[i][1];printf("%d\n",s);A. 11 B. 19 C. 13 D. 20
查看完整题目与答案
【单选题】下列哪种方法不能调换图层
A.
特性
B.
特性匹配
C.
帮助
查看完整题目与答案