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.
The answer is a symbiotic relationship.
Symbiosis is an interaction between two different species. Termites live feed on dead plant materials and cellulose. But their body cannot produce enzymes responsible for cellulose degradation. Therefore, they <span>established symbiotic interactions with gut bacteria which are able to digest the fiber in the wood. Gut bacteria break down carbohydrates to the smaller units</span><span>, which are then absorbed and oxidized by the termites</span>
Lions and cheetahs share the same food hence fight for their prey Is the answer
