Question

explain one biological importance of each of the following organic compounds in relation to cellular structure and function in plants and animals. (1)carbohydrates (2)proteins (3)lipids (4)nucleic acids

Explanation:

• Carbohydrates: Glucose (a simple carbohydrate) is the primary source of energy in cellular respiration. It is broken down to release ATP (adenosine triphosphate), which powers cellular activities. For example, in plants, glucose is produced during photosynthesis and used for energy - related processes like active transport across cell membranes.
• Proteins: Enzymes are a type of protein. Enzymes act as biological catalysts. They speed up biochemical reactions in cells. For instance, amylase (a protein enzyme) in the human digestive system breaks down starch (a carbohydrate) into smaller sugar molecules. In plants, enzymes are involved in processes like DNA replication during cell division.
• Lipids: Phospholipids are a major component of cell membranes. They form a bilayer structure. This bilayer is selectively permeable, allowing certain substances (like small non - polar molecules) to pass through while restricting others (like ions). In both plants and animals, this property is crucial for maintaining the internal environment of the cell and for processes such as signal transduction across the membrane.
• Nucleic Acids: DNA (deoxyribonucleic acid) is a nucleic acid. It contains the genetic information. In plants and animals, DNA is responsible for encoding the instructions for the synthesis of proteins. The sequence of nucleotides in DNA determines the sequence of amino acids in proteins, which in turn determines the structure and function of the proteins. For example, the DNA in a plant cell contains the genes for enzymes involved in photosynthesis, and in an animal cell, it contains genes for proteins like hemoglobin.

Answer:

1. Carbohydrates: Provide energy (e.g., glucose in cellular respiration).
2. Proteins: Enzymes (a type of protein) act as biological catalysts.
3. Lipids: Phospholipids form the cell - membrane bilayer (selectively permeable).
4. Nucleic Acids: DNA (a nucleic acid) contains genetic information for protein synthesis.