1. Cells: The Living Units Part C3
Cells: The Living Units
Part C

2. Stacked and flattened membranous sacs
Golgi Apparatus
Stacked and flattened membranous sacs
Functions in modification, concentration, and packaging of proteins
Transport vessels from the ER fuse with the cis face of the Golgi apparatus
Proteins then pass through the Golgi apparatus to the trans face
Secretory vesicles leave the trans face of the Golgi stack and move to designated parts of the cell

3. Golgi Apparatus
Figure 3.20a

4. Role of the Golgi Apparatus
Figure 3.21

5. Spherical membranous bags containing digestive enzymes
Lysosomes
Spherical membranous bags containing digestive enzymes
Digest ingested bacteria, viruses, and toxins
Degrade nonfunctional organelles
Breakdown glycogen and release thyroid hormone
Breakdown nonuseful tissue
Breakdown bone to release Ca2+
Secretory lysosomes are found in white blood cells, immune cells, and melanocytes

6. System of organelles that function to:
Endomembrane System
System of organelles that function to:
Produce, store, and export biological molecules
Degrade potentially harmful substances
System includes:
Nuclear envelope, smooth and rough ER, lysosomes, vacuoles, transport vesicles, Golgi apparatus, and the plasma membrane
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Endomembrane System

7. Endomembrane System
Figure 3.23

8. Membranous sacs containing oxidases and catalases
Peroxisomes
Membranous sacs containing oxidases and catalases
Detoxify harmful or toxic substances
Neutralize dangerous free radicals
Free radicals – highly reactive chemicals with unpaired electrons (i.e., O2–)

9. The “skeleton” of the cell
Cytoskeleton
The “skeleton” of the cell
Dynamic, elaborate series of rods running through the cytosol
Consists of microtubules, microfilaments, and intermediate filaments

10. Cytoskeleton
Figure 3.24

11. Dynamic, hollow tubes made of the spherical protein tubulin
Microtubules
Dynamic, hollow tubes made of the spherical protein tubulin
Determine the overall shape of the cell and distribution of organelles

12. Dynamic strands of the protein actin
Microfilaments
Dynamic strands of the protein actin
Attached to the cytoplasmic side of the plasma membrane
Braces and strengthens the cell surface
Attach to CAMs and function in endocytosis and exocytosis

13. Intermediate Filaments
Tough, insoluble protein fibers with high tensile strength
Resist pulling forces on the cell and help form desmosomes

14. Protein complexes that function in motility Powered by ATP
Motor Molecules
Protein complexes that function in motility
Powered by ATP
Attach to receptors on organelles

15. Motor Molecules
Figure 3.25a

16. Motor Molecules
Figure 3.25b

17. Pinwheel array of nine triplets of microtubules
Centrioles
Small barrel-shaped organelles located in the centrosome near the nucleus
Pinwheel array of nine triplets of microtubules
Organize mitotic spindle during mitosis
Form the bases of cilia and flagella

18. Centrioles
Figure 3.26a, b

19. Move substances in one direction across cell surfaces
Cilia
Whiplike, motile cellular extensions on exposed surfaces of certain cells
Move substances in one direction across cell surfaces
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Cilia and Flagella

20. Cilia
Figure 3.27a

21. Cilia
Figure 3.27b

22. Cilia
Figure 3.27c

23. Gene-containing control center of the cell
Nucleus
Contains nuclear envelope, nucleoli, chromatin, and distinct compartments rich in specific protein sets
Gene-containing control center of the cell
Contains the genetic library with blueprints for nearly all cellular proteins
Dictates the kinds and amounts of proteins to be synthesized

24. Nucleus
Figure 3.28a

25. Selectively permeable double membrane barrier containing pores
Nuclear Envelope
Selectively permeable double membrane barrier containing pores
Encloses jellylike nucleoplasm, which contains essential solutes
Outer membrane is continuous with the rough ER and is studded with ribosomes
Inner membrane is lined with the nuclear lamina, which maintains the shape of the nucleus
Pore complex regulates transport of large molecules into and out of the nucleus

26. Dark-staining spherical bodies within the nucleus
Nucleoli
Dark-staining spherical bodies within the nucleus
Site of ribosome production

27. Threadlike strands of DNA and histones
Chromatin
Threadlike strands of DNA and histones
Arranged in fundamental units called nucleosomes
Form condensed, barlike bodies of chromosomes when the nucleus starts to divide
Figure 3.29

28. Interphase Mitotic phase Cell Cycle
Growth (G1), synthesis (S), growth (G2)
Mitotic phase
Mitosis and cytokinesis
Figure 3.30

29. G1 (gap 1) – metabolic activity and vigorous growth
Interphase
G1 (gap 1) – metabolic activity and vigorous growth
G0 – cells that permanently cease dividing
S (synthetic) – DNA replication
G2 (gap 2) – preparation for division
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Late Interphase