The answer is D. You are welcome.
When two protein chains combine to form an active protein, the structural level is quaternary.
<h3>What is a quaternary structure?</h3>
The quaternary and tertiary structure of a protein is the tridimensional shape of the protein, which involves protein domains.
The quaternary protein structure refers to the different arrangements generated by different protein subunits.
The primary structure of a protein involves its amino acid sequence, whereas the second structure involves protein chains.
Learn more about quaternary structure here:
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Answer: C
No, because the human population depends on limited resources, and may suffer from war, disease, and famine l.
Answer:
Insulin regulates blood glucose levels
D a medium sized star because the largest star is canis majoris and the smallest star is brown dwarf..☺
