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【单选题】
某化合物 0.450g 溶于 30g 水中使冰点降低了 0.15°C ,化合物的分子量为( )。A.
18.6
B.
186
C.
254
D.
323
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【单选题】Which statement is not correct about constitutive genes?
A.
The expressive products of constitutive genes are absolutely necessary in all over life process.
B.
The expression of constitutive genes is much affected by environment factors.
C.
The constitutive gene expression is only effected by interacting between promoter and RNA polymerase.
D.
Constitutive gene expression is continual in most cells.
【单选题】Which of the following statements about homeotic genes is INCORRECT?
A.
Homeotic genes were first identified in invertebrates, but their homologs were found in almost all organisms.
B.
All homeotic genes contain consensus sequences that result in a specific DNA-binding motif.
C.
In vertebrates, homeotic genes are organized into two distinct clusters.
D.
All homeotic genes encode transcription factors that direct further gene expression.
E.
Homeotic genes exhibit a relationship between their order on the chromosome and the timing of their expression.
【简答题】简述循序渐进原则的贯彻要求。
【简答题】简述循序渐进原则及其贯彻的基本要求。
【单选题】Which of the following statements is true according to the passage?
A.
Genes may contribute to some common diseases.
B.
Environmental factors cause more diseases than genes.
C.
It is common that most fatal diseases are caused by genes.
D.
It is impossible to get clear-cut genetic answers at present.
【单选题】Which of the following statements is true according to the text?
A.
Genes may contribute to some common diseases.
B.
Environmental factors cause more diseases than genes.
C.
It is common that most fatal diseases are caused by genes.
D.
It is impossible to get clear-cut genetic answers.
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