Answer to Question 1
If the body does not receive all the essential amino acids it needs, the supply of essential amino acids will dwindle until body organs are compromised. Obtaining enough essential amino acids presents no problem to people who regularly eat foods containing high-quality proteins, such as meat, seafood, poultry, cheese, eggs, milk, and many soybean products. The proteins of these foods contain ample amounts of all the essential amino acids. An equally sound choice is to eat two different plant-based protein foods so that each supplies the amino acids limited in the other. In this strategy, the two protein-rich foods are combined to yield complementary proteins-proteins containing all the essential amino acids in amounts sufficient to support health. The two proteins need not even be eaten together, as long as the day's meals supply them both, and the diet provides enough energy and total protein from a variety of sources.
Answer to Question 2
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Examples of covalent modifications that occur to the amino terminal tails of histone proteins. The a
Base Pairing in DNA Is Complementary
Organization of proteins based on motifs
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Nucleic acids: Complementary base pairing
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