Formation of biomolecules | High school biology | Khan Academy

Sugar molecules contain carbon, hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and other carbon-based molecules that can be assembled into larger molecules (such as proteins or DNA), used for example to form new cells. As matter and energy flow through different organizational levels of living systems, chemical elements are recombined in different ways to form different products.

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Credits:
"DNA Helix CPK" by Ude [Public domain], via Wikimedia Commons:

"Rubisco" by ARP [Public domain], via Wikimedia Commons:

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