Summary. Enzymes are catalysts that, within the mild conditions of temperature, pH, and pressure of the cells, carry out chemical reactions at amazing high rate. They are characterized by a remarkable efficiency and specificity. Substrates are the substances on which enzymes act.
Answer:
Glyceraldehyde-3-Phosphate Dehydrogenase
Explanation:
Glyceraldehyde-3-Phosphate Dehydrogenase is responsible for the formation of 1,3-bisphosphoglycerate, which is then catalyzed to yield phosphoenolpyruvate by pyruvate kinase.
The correct answer to this question is this one: they lacked oxygen. The earliest organisms were completely heterotrophic in nature because of the reason that they lacked oxygen. <span>A heterotroph is an organism that cannot fix carbon and uses organic carbon for growth. </span>
