Scientists discovered that this enhancer associated with hair color has a binding site for a particular transcription factor. one form of the binding site has the sequence cactaaag and is associated with dark hair, and the other form of the binding site has the nearly identical sequence cgctaag and is associated with blond hair. how could these two nearly identical enhancer binding sites lead to different rates of initiating transcription of the regulated gene?

Homeodomain a conserved sequence of 60 amino acids used in the binding to DNA. Usually found in transcription factors, it is used to express genes that are related, more specifically in development to the make tissues associated with one another. 

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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the answer to your question is:

c. complementary base-pairing