Understanding Biological Molecules in AQA Biology

Proteins are made up of amino acids, which have a specific structure with an amino group, a carboxyl group, and a unique R group.Amino acids join together through peptide bonds, releasing a water molecule in the process.The primary structure of a protein is simply the linear sequence of amino acids.Secondary structure forms when the protein chain folds into regular patterns like alpha helices and beta sheets.Tertiary structure is the complete three-dimensional folding of the protein, stabilized by various chemical interactions.Finally, quaternary structure occurs when multiple protein subunits come together to form a functional protein complex.Let's examine the structure of nucleic acids, starting with their basic components.DNA contains four bases: Adenine, Thymine, Guanine, and Cytosine. These bases form specific pairs.In DNA, Adenine always pairs with Thymine, while Guanine pairs with Cytosine, forming the double helix structure.RNA differs from DNA in three key ways: it uses ribose sugar instead of deoxyribose, contains Uracil instead of Thymine, and is typically single-stranded.ATP, or Adenosine Triphosphate, serves as the universal energy currency in cells. It consists of an adenine base, a ribose sugar, and three phosphate groups.When ATP releases energy, it loses one phosphate group to become ADP, or Adenosine Diphosphate. This process is called dephosphorylation.This ATP-ADP cycle continues as cells use and regenerate energy through various metabolic processes.Let's review what we've learned about nucleic acids and cellular energy.Thanks for learning about nucleic acids and ATP with Spark.E!