Enzymes act as catalysts in biochemical reactions, lowering the activation energy required for the reaction to occur. This allows the reaction to proceed more quickly at physiological temperatures.

Lipids are not considered biological macromolecules in the same way that carbohydrates, proteins, and nucleic acids are. Lipids are a diverse group of hydrophobic molecules that include fats, oils, waxes, and steroids.

ATP (adenosine triphosphate) is the primary energy currency of cells. It acts as an energy storage and transfer molecule, providing energy for various cellular processes such as muscle contraction, nerve impulse transmission, and chemical synthesis.

Enzymes are proteins that act as catalysts, increasing the rate of specific chemical reactions in cells. Hormones, antibodies, and receptors are involved in different cellular processes, but they do not have catalytic activity like enzymes.

DNA (deoxyribonucleic acid) is the primary genetic material in cells. It contains the instructions for protein synthesis and other cellular functions. DNA stores genetic information in the form of a sequence of nucleotides.

Phospholipids are a type of lipid that consists of a glycerol backbone, two fatty acid chains, and a phosphate group. They are the major components of cell membranes, forming a bilayer that separates the inside and outside of the cell.

Carbohydrates are a major source of energy for cells. They are broken down into glucose, which is then converted into ATP through cellular respiration. Carbohydrates also serve as structural components in cell walls and other cellular structures.

Carrier proteins are a type of membrane protein that transports molecules across cell membranes by binding to them and facilitating their movement. Channel proteins, receptor proteins, and enzyme proteins have different functions in cellular processes.

RNA (ribonucleic acid) plays a crucial role in protein synthesis. It carries the genetic information from DNA to the ribosomes, where it serves as a template for the synthesis of proteins.

Steroids are a type of lipid that consists of four fused carbon rings. They are a major component of hormones, vitamins, and other signaling molecules in cells.

Proteins play a crucial role in cellular metabolism by acting as enzymes. Enzymes catalyze specific chemical reactions, increasing their rate and allowing them to occur under physiological conditions.

Receptor proteins are a type of membrane protein that recognizes and binds to specific molecules, such as hormones or neurotransmitters. This binding triggers a cellular response.

Vitamins are organic compounds that are required in small amounts for various metabolic processes. They often act as cofactors for enzymes, helping them to catalyze specific chemical reactions.

Phospholipids are a type of lipid that consists of a glycerol backbone, two fatty acid chains, and a phosphate group. They are the major components of cell membranes, forming a bilayer that separates the inside and outside of the cell. Phospholipids are also found in nerve tissue.

Minerals are inorganic elements that are required in small amounts for various metabolic processes. They often act as cofactors for enzymes, helping them to catalyze specific chemical reactions.