题目内容

两直线的三面投影都相交时，则空间两直线就一定相交。（）

A. 对
B. 错

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空间两直线若不平行，则必定相交。（）

A. 对
B. 错

The specific DNA sequences to which the transcription factors bind are referred to as _____

A.replication elements
B.blocking factors
C.transcription factors
D.regulatory elements

The TATA box is often used as an indicator of the presence of a promoter.

A.True
B.False

You wanted to study the assembly of preinitiation complex in eukaryotes. This is by the means of DNA-protein interaction. Which of these methods you can’t absolutely put in use there?

A.Footprinting
B.Crystal structure
C.EMSA
D.Primer extension