Adenosine triphosphate (ATP) consists of an adenosinemolecule<span> bonded to three phophate groups in a row. ... This occurs when a </span>molecule<span> of adenosine diphosphate (ADP) uses the </span>energy released<span> during cellular respiration to bond with </span>a third phosphate<span> group,</span>becoming<span> a </span>molecule<span> of </span>ATP<span>.</span>
My 2 cents below, I tried to think through the other ones:
A. Yes, because an amino acid change has occurred.
(A gene mutation occurred, not an amino acid change)
B. Yes, because all mutations change the resulting protein.
(Sounds correct. Gene -> mRNA -> protein)
C. No, because the amino acid sequence has not been changed.
(The gene mutation means the amino acid sequence <em>has</em> changed)
D. No, because mutations in the DNA do not affect the mRNA sequence.
(They do so)