Antimicrobial agents active <span>against mycobacteria have to be administered for months or years rather than the typical 10-30 days prescribed to treat other infections because mycobacteria reproduce very slowly.
So, over the period of time that mycobacteria reproduce, antimicrobial agents have to be taken so as to prevent these mycrobacteria from invading the body completely. Once their reproduction is completely prevented, antimicrobial agents don't have to be administered anymore.
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Answer:
A = Activator
B = Effector
Explanation:
An activator is a protein which typically binds to a short (50–1500 bp) region of DNA which might be located either upstream (mainly) or downstream of a gene so as to cause increased transcription. This particular region of DNA is known as enhancer and activator is also known as transcription factor. Activator is a trans-acting factor which binds to the cis-acting factor which is enhancer so as to enhance transcriptional expression.
But another protein named as effector may restrict activator from binding to the enhancer leading to a decrease in transcriptional expression by binding to the activator allosterically. Allosteric binding of effector to the activator causes conformational change in activator so it can no longer bind the enhancer.
Answer: when each chromosome has been duplicated.
Explanation:
