Select all that are monomers. (Check all that apply.)

Explanation

In biology, monomers are the simplest units that combine to form larger molecules called polymers. In your question, we need to evaluate each of the provided options to determine which are monomers: A nucleotide: A nucleotide is indeed a monomer, serving as the basic unit of nucleic acids like DNA and RNA. Each nucleotide consists of three components: a nitrogenous base, a sugar, and a phosphate group, and multiple nucleotides join to form DNA or RNA strands. A strand of DNA: This is not a monomer. A strand of DNA is a polymer made up of many nucleotides linked together. Therefore, it does not qualify as a monomer. An amino acid: Amino acids are also monomers that link together to form proteins. There are 20 different standard amino acids in biological systems, and they combine in specific sequences to create various proteins essential for life. Glucose: Glucose is a simple sugar and a monomer known as a monosaccharide. It can link with other glucose molecules or different monosaccharides to form complex carbohydrates like starch and cellulose. In conclusion, the correct monomer options from your list are: A nucleotide An amino acid Glucose Thus, the monomers among the choices provided are nucleotides, amino acids, and glucose.