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Chapter 3

BIOL 1500 Chapter 3: Chapter 3


Department
Biology
Course Code
BIOL 1500
Professor
Tanya Da Sylva
Chapter
3

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September 18th, 2018
Chapter 3
All Cells Have Features in Common
1) Each cell has:
a) Ribosomes
b) Cell Membrane
c) Cytoplasm
d) Cytosol
e) Abundant surface area
i) Accommodate these exchanges efficiently
ii) Minimize contact with environment
iii) Low surface area = minimize exchange of material or heat with the
environment
The Three Domains of Life
Cell Type
Nucleus
Membrane-
Bounded
Organelles
Membrane
Chemistry
Typical Cell
Size
Domain
Bacteria
Prokaryotic
Absent
Absent
Fatty acids
1-10um
(metric meter)
Domain
Archaea
Prokaryotic
Absent
Absent
Nonfatty acids
lipids
1-10um
(metric meter)
Domain
Eukarya
Eukaryotic
Present
Present
Fatty acids
10-100um
(metric meter)
Fluid Mosaic Protein Membrane
Transport Proteins
Embedded in phospholipid
Create passage for ions, glucose, and
other polar substances pass in and out of
cell
Enzymes
Facilitate chemical reactions = sustain life
Recognition Proteins
Carbohydrates attaching to cell surface
proteins called “name tags” - help for
immune system to recognize their own
cells
Adhesion Proteins
Enable cells to stick to one another
Receptor Proteins
Bind to molecules outside cell and trigger
response inside cell
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