In lac operon the role of allolactose is:()
A. Repress the negative regulation
B. Induce the negative regulation
C. Repress the positive regulation
D. Induce the positive regulation
查看答案
The lac operon regulates gene expression on:()
A. Replication level
B. Transcription level
C. Post-transcription level
D. Translation level
E. Post-translation level
The core enzyme of RNA polymerase slide along the template strand in the direction of 5'→3'.()
Transcription products in prokaryotes must be polycistron.()
Theρfactor possesses both ATPase and helicase activity.()
微信支付 
支付宝支付