Ethics is a term used in scientific experiment to refer to conducting experiments under the correct rules of conduct necessary when performing a research.It is a moral responsibility of a researcher to protect participants in a research from harm.Some of the ethical issues are: beneficence, respecting privacy, informed consent and respecting anonymity and confidentiality.
All scientific studies that involve human or animals become a matter of ethical concern and this is so because there are several moral principles of the society which are at stake.
For example - society believes than even an embryo in the womb of a woman, who has not taken birth has the right to live and thus studies such as "stem cell researches" involving usage of embryonic cell are ethically condemned.
Genetic studies are also a matter of ethical concerns as society believes that hereditary history is a personal matter and should not be tried and tested openly.
Pyruvic acid enters the mitochondria where in the presence of oxygen it is converted into acetyl coenzyme A. Acetyl coenzyme A joins the Krebs cycle in which it is broken down to carbon dioxide, water and energy which is used to produce ATP. ATP is a complex organic molecule.