Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Name:_______________________ CH.10 CELL GROWTH & DIVISION Cell Growth “Cells don’t just grow, they divide” Limits to Cell Growth: 1. Puts more demands on DNA Ex: Library in a growing town. 2. More trouble with moving nutrients and wastes across the cell membrane. Ex: SA:V ratio Cell Division: 1. Before a cell becomes too large, a growing cell divides into 2 daughter cells. 2. Before a cell divides, the cell replicates (copies) all of its DNA so that each daughter cell has its own complete set. Ex/ Each 1 gets its own library Q’s 1. Give two reasons why cells divide? 2. How is a cell’s DNA like the books in a library? Chromosomes: Carries DNA and proteins - The cells of every organism have a specific number of chromosomes (humans = ) Chromosome DNA double helix Proteins - Each chromosome consists of 2 identical “sister” chromatids. - Each pair of chromatids are connected by a centromere. - Chromosomes are only visible right before cell division. The Cell Cycle – Interphase: The “in between” period before a cell divides; also the longest phase. (3 Phases: G1, S, G2) G1 Phase – the cell grows S Phase – the cell synthesizes and replicates DNA G2 Phase – the cell organizes organelles for cell division. “Gets ready”. Cell Division – the division of the cell M Phase – mitosis and cytokinesis occurs Mitosis – the cell’s nucleus divides Cytokinesis – the cell’s cytoplasm splits and pinches apart Mitosis – The division of the cell nucleus occurs in 4 parts: o Prophase, Metaphase, Anaphase, Telophase Cell Cycle includes is divided into is divided into Q’s 1) Name the main events of the cell cycle. 2) What are chromosomes made of?