BIO152H5 Chapter Notes - Chapter 6: Endoplasmic Reticulum, Microscopy, Cell Fractionation
Document Summary
Improvements in microscopy that affect the parameters of magnification, resolution, and contrast have catalyzed progress in the study of cell structure. Light microscopy (lm) and electron microscopy (em), as well as other types, remain important tools: cell biologists can obtain pellets enriched in particular cellular components by centrifuging disrupted cells. Concept 6. 1 biologists use microscopes and the tools of. 108 111) at sequential speeds, a process known as cell fractionation. Chloroplasts are present only in cells of photosynthetic eukaryotes. The eukaryotic cell"s genetic instructions are housed in the nucleus and carried out by the ribosomes. The endomembrane system regulates protein traffic and performs metabolic functions in the cell. Surrounded by nuclear envelope (double membrane) perforated by nuclear pores; nuclear envelope continuous with er. Houses chromosomes, which are made of chromatin (dna and proteins); contains nucleoli, where ribosomal subunits are made; pores regulate entry and exit of materials.