Some proteins that bind to DNA block transcription, whereas other proteins can activate transcription
Indicate whether the statement is true or false.
Answer: TRUE
You might also like to view...
DNA ligase mediates the insertion of foreign DNA into a vector, but it will only be able to do so if the inserts and vector have matching sticky or blunt ends
Indicate whether the statement is true or false.
The mechanism of phase variation in Salmonella typhimurium:
A. uses site-specific recombination to invert the fljA and fljB genes so they now are not contiguous with their promoter. Expression of these genes is now prevented. B. uses site-specific recombination to invert the fljA and fljB promoter, preventing transcription of the two genes. Without repressor the fljC protein is now expressed. C. uses site-specific recombination to delete the repressor, fljA. Without repressor the fljC protein is now expressed. D. uses site-specific recombination to delete the fljB gene so only fljC can be expressed. E. None of the choices given is true.
At which neuronal structure does summation occur?
a. dendrites b. cell body c. axon hillock d. Schwann cells e. axon terminals
Dry heat
A. is less efficient than moist heat. B. will sterilize at 121°C for 15 minutes. C. includes tyndallization. D. is used in devices called autoclaves. E. cannot sterilize.