BIOL 1115 Lecture 4: Chapter 4B

• School: Northeastern University
• Department: Biology
• Course: BIOL 1115
• Professor: terrikanner

Document Summary

* includes tables and figures unless otherwise mentioned. 4. 1 only figure 4. 1 (note size differences virus, bacteria, ribosome, mitochondria, plant cell, human) 4. 2 all (be sure to read genomes and proteomes connection) Function: cellular structures involved in producing polypeptides during the process of translation. The ribosome is composed of two subunits, one small and one large. Each subunit contains one or more rna molecules and several types of proteins. Most of the rna molecules that are components of ribosomes are made in the vicinity of the nucleolus. The ribosomal proteins are created in the cytosol and then imported into the nucleus through the nuclear pores. The ribosomal proteins and rna molecules then assemble in the nucleolus to form ribosomal subunits. Then the subunits exit through the nuclear pores into the cytosol where they are needed for protein synthesis: what comprises the two ribosomal subunits, why do cells vary in the number of ribosomes they contain, example.