Cell biology

Lipids

Lipids are chemical compounds in the body that serve various functions. They are non-water-soluble, fatty or waxy substances produced by the body. Lipids have different roles, including transporting and storing energy (triglycerides), sending cellular messages (steroid hormones), aiding fat digestion (bile salts), generating energy (fatty acids), and forming cell membranes (phospholipids and cholesterol). Phospholipids act as gatekeepers, allowing specific molecules into cells, often requiring the assistance of proteins.

Nucleic acids

Nucleic acids, often called polynucleotides, are long-chain molecules composed of repeating units called nucleotides. They play a crucial role in passing on hereditary traits, protein synthesis, and various applications like DNA fingerprinting for paternity and criminal identification, as well as in studies related to genetics and evolution.

Phospholipids

Phospholipids are essential components of cell membranes, possessing both water-soluble and water-insoluble regions. They have a unique structure with hydrophobic tails and hydrophilic head groups. This allows them to form the foundation of biological membranes, which are vital for cell integrity and function.

Enzymes

Enzymes are proteins that accelerate chemical reactions in our bodies, including the digestion of food to produce energy. They are present in various body parts such as saliva, pancreas, intestines, and stomach, where they break down fats, proteins, and carbohydrates. Enzymes are essential for growth and cell repair and also play roles in breathing, muscle development, nerve function, and detoxification.