Answer:
<h2>
<em><u>Lactate dehydrogenase is an enzyme found in nearly all living cells. LDH catalyzes the conversion of lactate to pyruvate and back, as it converts NAD⁺ to NADH and back. A dehydrogenase is an enzyme that transfers a hydride from one molecule to another. LDH exists in four distinct enzyme classes</u></em></h2>
<em><u>please follow me and mark me as </u></em><em><u>brainlist</u></em>
When you use "por" or "para" your saying the word "for" so for example
enlgish: I need to go for a game
spanish:yo nesicito ir para un juego
so technically you use it when the sentence has the word "for" or the word is needed