ions are necessary to activate the binding sites on the actin filaments. The molecule is required each time the myosin head detaches from one site and reattaches to another. Fill in the blanks please!

Calcium ions are necessary to activate the binding sites on the actin filaments. The molecule ATP is required each time the myosin head detaches from one site and reattaches to another.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

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

explanation: