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Lecture 27

BSCI 10001 Lecture Notes - Lecture 27: Nuclear Pore, Nuclear Membrane, Nucleolus


Department
Biological Sciences
Course Code
BSCI 10001
Professor
Adam Arthur Leff
Lecture
27

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Cells and Tissues
Cells and Tissues
Carry out all chemical activities needed to sustain life
Cells are the building blocks of all living things
Tissues are groups of cells that are similar in structure and function
Anatomy of the Cell
Cells are not all the same
All cells share general structures
Cells are organized into three main regions
Nucleus
Cytoplasm
Plasma membrane
The Nucleus
Control center of the cell
Contains genetic material (DNA)
Three regions
Nuclear membrane
Nucleolus
Chromatin
Nuclear Membrane
Barrier of nucleus
Consists of a double phospholipid membrane
Contain nuclear pores that allow for exchange of material with the rest of the cell
Nucleoli
Nucleus contains one or more nucleoli
Sites of ribosome production
Ribosomes then migrate to the cytoplasm through nuclear pores
Chromatin
Composed of DNA and protein
Scattered throughout the nucleus
Chromatin condenses to form chromosomes when the cell divides
Plasma Membrane
Barrier for cell contents
Double phospholipid layer
Hydrophilic heads
Hydrophobic tails
Also contains protein, cholesterol, and glycoproteins
Plasma Membrane
Plasma Membrane Specializations
Microvilli
Finger-like projections that increase surface area for absorption
Plasma Membrane Specializations
Membrane junctions
Tight junctions
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