BISC207 Lecture 8: Chapter 7-2

• School: University of Delaware
• Department: Biological Sciences
• Course: BISC207
• Professor: Jennifer Nauen

Document Summary

Cells are much bigger than the molecules they contain. How many h2o molecules in rbc 7 micrometers long. 3 trillion can fit in a rbc. Your atp turnover per cell is about 10 million molecules/second. Some prokaryotes run photosynthesis on internal membranes. Some have membrane bound compartments for specialized tasks. More accurate representation on how crowded the cell really is. A nerve cell (neuron) is the longest cell in our body. Axons have supporting cells known as myelin sheath. You can develop multiple sclerosis due to the breakdown of the myelin sheath. Region inside plasma membrane but outside of organelles. Contains a dense network of protein filaments called the cytoskeleton. Cytoskeleton provides cell shape, organization and movement, it is dynamic and highly regulated. Small molecules and ions diffuse through pores. Proteins and nucleotides enter nucleus; ribosomal subunits and mrna exit. Dna wrapped up around protein to fit inside the cell. Er is a network of membranes that encloses a humin.