Phenylketonuria (PKU) can be defined as a rare metabolic disorder caused by a deficiency in the production of the hepatic (liver) enzyme phenylalanine hydroxylase (PAH). PKU is the most serious form of a class of diseases referred to as hyperphenylalaninemia, all of which involve above normal (elevated) levels of phenylalanine in the blood.
All organisms carry out cellular respiration (except viruses) - it is the basic process which supports life as we know it. Viruses, on the other hand, are not always câ¦onsidered to be living, one of the reasons being that they do NOT carry out cellular respiration.
How does an organism react if the process of cellular respiration does not occur? Well, I think the question is somewhat flawed. If you mean that there is no oxygen, which stops to processes of the Krebs cycle and oxidative phosphorilation, then the answer â¦ is as follows: If there is no oxygen, glycolysis will keeping producing ATP regardless.