Which Element Can Be Found in the Center of Each

question 56

Multiple Choice

Which element can be found in the center of each heme ring that makes up the protein hemoglobin?

• A) iron
• B) calcium
• C) helium
• D) mercury
• E) sodium

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Relating to a large city or densely populated urban area.

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A technology that creates a secure, encrypted connection over a less secure network, such as the Internet, to provide privacy and anonymity.

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A private network that allows access to partners, vendors, and selected external parties, extending certain computing resources and information beyond an organization's intranet.