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who was the inventor of the cotton gin and the man behind the idea of interchangeable parts

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Aminolevulinate dehydratase (ALAD) is an enzyme that relies on zinc as a coenzyme. A zinc ion binds to the ALAD active site, where it forms favorable interactions with the side chains of three amino acids. Researchers have found that substituting a lead ion for a zinc ion in the ALAD active site causes inhibition of ALAD.Which of the following statements best helps explain how the lead ion causes inhibition of ALAD?

Scientists are studying the structure and function of Receptor X, a single-polypeptide protein that is found in the membrane around certain types of cells. Receptor X contains no alpha-helices or beta sheets. A specific molecule outside the cells is recognized and bound by Receptor X. The binding of the molecule to Receptor X causes the cells to have a particular response.To study the structure and function of Receptor X, the scientists are altering the sequence of small sections of the receptor. Both the normal sequence of a five‑amino acid section of Receptor X and an altered sequence that contains two amino acid substitutions are shown in Figure 1.(a) Identify the process used to form the covalent peptide bonds that join amino acids into a polypeptide.(b) The change in the amino acid sequence illustrated in Figure 1 caused a change in the shape of Receptor X. Based on the R groups of the original and substituted amino acids, explain why Receptor X changed shape.(c) Using the template below that represents the four levels of protein structure, place an X on each level that is expected to be altered as a result of the amino acid substitutions shown in Figure 1.d) Explain how the amino acid substitution shown in Figure 1 is most likely to affect the function of Receptor X.

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