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Lecture 6

BIOL 1201 Lecture Notes - Lecture 6: Old TextsPremium


Department
Biological Sciences
Course Code
BIOL 1201
Professor
Moroney, James
Lecture
6

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Biol 1201- Lecture 6- Cell Structure
Plasma membrane
Major components are phospholipids
Regulates movement of materials in and out of cell
Nucleus
Surrounded by double-membrane- envelope
Possesses one or more nucleoli
Possesses chromatin-genetic info in nucleus
Stores genetic info (DNA), organized in chromosomes.
Separates:
oDNA from cytosol
oTranscription from translation
Key Features
oouter membrane
oinner membrane
onucleolus
FIG 6.10 (Will have to Identify things on tests)
Cytosol
The portion of the cell enclosed by the plasma membrane but not part of any organelle
Key Features:
oThe cytoskeleton
oRibosomes
oMetabolic enzymes
Ribosomes
Structure:
oProteins and RNA (ribosomal RNA, or RNA, produced in the nucleolus)
oMade up of two subunits
Function:
oSite of translation (protein synthesis)
Bound Ribosome
Free Ribosome: made for mitochondria
Protein and ribosomal RNA
Prokaryotic and eukaryotic forms
Site of translation
Cell Wall
Found in plants, fungi, protists
Protects the cell from lysis
Controls shape of cell
Found outside of the plasma membrane
Is NOT a permeability factor
Plasma membrane controls movement of small molecules into cell
Endomembrane System
Synthesis, packaging, and transport of many cell constituents
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