Biological molecules

Proteins are macromolecules made up of monomers called amino acids, which link together via peptide bonds to form polypeptide chains. Glucose (Option A) is incorrect because it is a monomer that polymerizes to form carbohydrates like starch and cellulose, while nucleotides (Option C) are the building blocks of nucleic acids.

DNA replication is semi-conservative because each new DNA molecule contains one original template strand and one newly synthesized strand. This was proven by Meselson and Stahl, whereas the conservative model incorrectly predicted that the original parent double helix would remain entirely intact.

Proteins are macromolecules made up of monomers called amino acids, which link together via peptide bonds to form polypeptide chains. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Glucose (Option A) is incorrect because it is a monomer that polymerizes to form carbohydrates like starch and cellulose, while nucleotides (Option C) are the building blocks of nucleic acids.
• !They do not lower the temperature of cells, as changing cellular temperature would disrupt homeostasis and potentially denature proteins.

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