Molecules:
* Proteins: A massive amount of protein synthesis occurs during the growth phases. This includes:
* Enzymes: For various metabolic processes like DNA replication, cell growth, and repair.
* Structural proteins: To build new organelles and the cytoskeleton.
* Cyclin proteins: Critical for regulating the cell cycle.
* Signaling proteins: For communication between cells and within the cell.
* Lipids: For building cell membranes, which expand as the cell grows. This includes phospholipids, cholesterol, and other membrane components.
* Carbohydrates: For energy storage (e.g., glycogen) and as building blocks for other molecules.
* Nucleotides: The building blocks of DNA and RNA. They are synthesized for replication and transcription.
Cell Parts:
* Organelles: The cell's internal structures grow and divide. This includes:
* Mitochondria: For energy production. They increase in number during G1 and G2.
* Ribosomes: For protein synthesis. They are produced in the nucleolus and transported to the cytoplasm.
* Endoplasmic reticulum (ER): A network of membranes involved in protein folding and lipid synthesis. It expands significantly during growth.
* Golgi apparatus: Processes and packages proteins and lipids. It also grows and replicates.
* Lysosomes: For waste breakdown. They increase in number as the cell prepares for division.
* Cytoskeleton: The internal framework of the cell that provides shape, structure, and movement. It expands and rearranges during growth.
* Centrioles: These structures are involved in organizing microtubules and are essential for cell division. They duplicate during G1.
Other Processes:
* DNA replication: During the S phase, which is part of the growth phase, DNA is duplicated to ensure each daughter cell receives a complete copy of the genome.
* Cellular respiration: The cell increases its metabolic activity to generate enough energy to support its growth and synthesis processes.
Important Note: The specific molecules and cell parts synthesized will vary depending on the cell type and its function.
By synthesizing these molecules and cell parts, the cell prepares itself for the crucial division phase, ensuring that each daughter cell inherits the necessary components to survive and function independently.
