AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: The molecule that acts as the reducing agent in redox reactions D) loses electrons and gains energy. The reducing agent is the term used to refer to a molecule that loses its electrons (the molecule is oxidized) to reduce the other molecule in the reaction.

Detailed explanation-2: -The atom or molecule that donates electrons (in this case, magnesium) is called the reducing agent, because its donation of electrons allows another molecule to become reduced.

Detailed explanation-3: -NADH is very good at donating electrons in redox reactions (that is, its electrons are at a high energy level), so it can transfer its electrons directly to complex I, turning back into NAD +start superscript, plus, end superscript.

Detailed explanation-4: -chemical compound classification reaction, sodium is called the reducing agent (it furnishes electrons), and chlorine is called the oxidizing agent (it consumes electrons). The most common reducing agents are metals, for they tend to lose electrons in their reactions with nonmetals.

Detailed explanation-5: -3 Redox Reactions. The oxidation-reduction or redox reactions involve the transfer of electrons between an electron donor (that becomes oxidized) and an electron acceptor (that becomes reduced).