One histone modification that is seen consistently in many species is the addition of an acetyl group tothe twelfth lysine in the h4 protein. if you were a geneticist working on yeast and had a clone of the h4 gene, what could you do to test whether the acetylation at this specific lysine was necessary for the functioning of chromatin?

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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fabric is silk wool ext. paper isnt

explanation:

u cant make fabric out of paper cause paper comes from wood while fabric comes from animals

the answer is "a.) well–developed vascular system."

explanation: