Answer:
A covalent bond forms between two Nonmetals!
Explanation:
A covalent bond always forms between the electrons of two Nonmetals.
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The binding of a cell<span> to another </span>cell<span>, or a cell to a </span>surface<span>, via specific </span><span>cell adhesion molecules</span>
These substances are called reactants.
Only DNA contains the base, thymine, which binds with adenine. Whereas RNA contains the base, uracil, which binds with adenine. Also the structure of their sugars are different: Deoxyribose, in DNA, contains one less oxygen than RNA's ribose sugar.
I believe that in a respiration equation, energy acts as a reactant.