BISC207 Chapter Notes - Chapter 7: Nuclear Lamina, Nucleolus, Nuclear Membrane
25
BISC207 Full Course Notes
Verified Note
25 documents
Document Summary
Chapter 7: prokaryotic cell structures, the most prominent structure is the chromosome. Most bacterial and archaeal species have a single, circular chromosome that consists of a large dna molecule associated with proteins. The dna molecules contains information, and the proteins provide structural support for the dna. Segments of dna that contain information for building function rnas are called genes: the region of the cell where the circular chromosome is located is called. To fit in the cell, the dna double helix coils on itself with the aid of enzymes to form a compact, (cid:498)supercoiled(cid:499) structure the nucleoid. Plasmids contain genes but are physically independent of the cellular chromosome. The photosynthetic membranes observed in bacteria develop as infoldings of the plasma membrane and contain the enzyme and pigment molecules required for these reactions to occur. In some cases, vesicles pinch off as the plasma membrane folds in. In other cases, flattened stacks of photosynthetic membrane remain connected to the plasma membrane.