NUR1 200 Chapter Notes - Chapter 7: Endoplasmic Reticulum, Dna Replication, Restriction Point
Document Summary
Autosomal cell are diploid (2n) and germ cells are haploid (n). In humans these numbers are 46 and 23 respectively. Consists of four stages: g1, s, g2 and m. the first three are known as the interphase and this phase is the longest part of the cell cycle. Cells that are simply living and are not preparing for division are in the g0 stage, which is an offshoot from g1. During the interphase cannot see chromosomes since they are in less condensed chromatin. M stage: mitosis: consists of mitosis along with cytokinesis (splitting of cytoplasm and organelles into two daughter cells). Mitosis has four phases: prophase, metaphase, anaphase, telophase. Also use p53: cyclins & cyclin-dependent kinases (cdk): molecules responsible for cell cycle, cdk"s need presence of right cyclins to be activated. During cell cycle, the concentration of cyclins increases or decreases.
