For Each of the Following Sentences, Fill in the Blanks

Essay

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below.Not all words or phrases will be used; each word or phrase should be used only once.
$\begin{array}{lll}\text { allosteric } & \text { ligand } & \text { secondary } \\\text { domain } & \text { primary } & \text { subunit } \\\text { helix } & \text { quaternary } & \text { tertiary }\end{array}$

The α helices and β sheets are examples of protein __________ structure.A protein such as hemoglobin, which is composed of more than one protein __________, has __________ structure.A protein's amino acid sequence is known as its __________ structure.A protein __________ is the modular unit from which many larger single-chain proteins are constructed.The three-dimensional conformation of a protein is its __________ structure.