Which is a monomer of a protein? A. monosaccharide B. amino acid C. nucleotide D. fatty acid
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Answer

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Step 1:
I'll solve this step-by-step:

Step 2:
: Understand the definition of a monomer

- A monomer is the basic structural unit that combines to form a larger molecule (polymer) - In the context of proteins, we need to identify which molecule serves as the basic building block

Step 3:
: Analyze each option

A. Monosaccharide - This is a simple sugar (monomer of carbohydrates) - NOT the monomer of proteins B. Amino acid - Amino acids are the fundamental building blocks of proteins - They link together through peptide bonds to form protein chains - CORRECT answer C. Nucleotide - Nucleotides are monomers of nucleic acids (DNA and RNA) - NOT the monomer of proteins D. Fatty acid - Fatty acids are components of lipids - NOT the monomer of proteins

Step 4:
: Confirm the protein structure

- Proteins are polymers composed of amino acids - Amino acids have a central carbon atom bonded to:

Step 5:

An amino group ($$NH_{2}$$)

Step 6:

A carboxyl group ($$COOH$$)

Step 7:

A side chain (R group)

Final Answer

B. amino acid