The cylinder seal is a small round cylinder,<span>invented around </span>3500 BC<span> in the </span><span>Near East. It was a form of signature. And that is why it was used to ensure that no authorized person could gain access to whatever was being sealed.</span>
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Answer:
-A disulfide bond joins the sulfur atoms in two adjacent polypeptide chains.
-Permanent wave solution breaks a disulfide bond by adding a hydrogen atom to each of its sulfur atoms.
-The sulfur atoms attach to the hydrogen atom from the permanent waving solution, breaking their attachment to each other.
-Once the disulfide bond is broken, the polypeptide chains can form into their new curled shape. Reduction breaks disulfide bonds and oxidation reforms them.
Explanation:
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<span>Earliest known ceramics: Ancient Greeks made pots for functional use. The Greeks would paint them with elaborate decorations during the 6th and 5th century BC. Circa 2500 BC: Bronze Age bowls and other ceramics 1000 BC (3000 years ago): Chinese ceramics 700-800 AD: Mayan vases and other ceramics</span>