ADH and ADLH are enzymes that catalyze each reaction in liver cells. A buildup of acetaldehyde is toxic to cells. Many different versions of the enzymes are present in human populations. Some versions have faster or slower reaction rates than others.

a compound light microscope is used to magnify objects in steps.  

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it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.

while the heads of the phospholipid structure attract water, the tails are hydrophobic. the model shows how the hydrophilic section folds around the fluid molecules to bring them into the cell so they don’t need to pass through the hydrophobic tails.