Correct answer is option D.
Transcription activators accelerate transcription, while transcription factors assist RNA polymerase binding.
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Explanation</u></h2>
Transcription factors are the proteins which help in proper binding of RNA polymerases in the promoter region of DNA so as to facilitate transcription.
Activators on the other hand, help in the enhancement of the transcription rate.
Transcriptional activators are basically proteins which bind to the regulatory elements known as enhancers so as to increase the rate of transcription. Enhancers are specific DNA sequences, which may be present in the upstream or downstream region of the gene which is going to be transcribed.
It may be noted here that transcription factors are only present in eukaryotes. In prokaryotes, sigma factors are present instead of transcription factors to facilitate proper binding of RNA polymerases on the DNA.
<h2>Two pieces of information </h2>
Sonar is an instrument which is used to search for things which are underwater. It is also used to find the depth of water by giving out ultrasonic vibrations into the water. The time which the vibrations take to return assists to find the distance of the reflecting surface.
A. Patient is male because there is a Y chromosome
B. 47 chromosomes
C. Down syndrome or trisomy 21
Answer:
the answer is D.
Explanation:
The heritable variation is defined as the variance of the breeding values among individuals.
First
Crude oil is piped from an underground reserve to the surface.
Crude oil is transported to a refinery by pipeline or tanker
crude oil is refined to make gasoline and other products.
Gasoline is transported by tanker truck to a gas station
Gasoline is pumped into a car‘s gas tank.
