The specialist caterpillars of the monarch butterfly

(Danaus plexippus) are insensitive to the terpenoid toxins. They feed on milkweed leaves and retain the cardenolides. As a result, most insectivorous birds quickly learn to avoid eating monarch caterpillars and adult monarch butterflies.

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#XL - Q Biochemistry

N-linked oligosaccharides

carbohydrate chains attached to the amide nitrogen of asparagine

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#XL - Q Biochemistry

Uncompetitive inhibitors bind only to the enzyme-substrate complex and not to the free enzyme. 

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Dynamic instability 

Rapid interconversion between a growing and shrinking state, at a uniform free tubulin concentration

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Membrane contact sites (MCSs)

Mitochondria establish MCSs with many other organelles, including ER, lysosomes, peroxisomes, the plasma membrane, the Golgi, endosomes, and even lipid droplets.

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#XL - R Botany