Biology 1001A Lecture Notes - Lecture 4: Sister Chromatids, Spindle Apparatus, G1 Phase
23 Aug 2017
School
Department
Course
Professor
Document Summary
Biology lecture 4: phases and main characteristics of the cell cycle. Three elegantly interrelated systems: an elaborate master program of molecular checks and balances ensures an orderly and timely progression through the cell cycle. Within the overall regulation of the cell cycle, a process of dna synthesis replicates each dna chromosome into two copies with almost perfect fidelity. A structural and mechanical web of interwoven cables and motors of the cytoskeleton separates the replicated dna molecules precisely into the daughter cells: stages and main characteristics of mitosis. In eukaryotes, the heredity information of the nucleus is distributed among several linear, double stranded dna molecules. Dna molecules are combined with proteins that stabilize the dna and assist in packaging dna during cell division, and influence the expression of individual genes. The chromosome complement is called diploid (second copy). Some microorganisms have only one copy called haploid.
