Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


in chemistry
any substance that in small amounts is capable of increasing activity of catalyst.
eg:tin added to platinum reforming 
in genetics
a site on DNA molecule at which RNA polymerase binds and initiates transcription

a gene sequence that activates transcription.

2 5 2
I am not under standing what you are saying
answer is nice
thanks for helping
They are the chemical substances that are added to solid catalysts to improve its performance in a chemical reaction..but by itself it has little or no catalytic effect..

0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts