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Chapter

LIFE 102 Chapter Notes -Cell Fractionation, Nuclear Membrane, Cell Membrane


Department
Life Science
Course Code
LIFE 102
Professor
professor

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Chapter 6
All organisms are made of cells and are packages
What kind of lipids make up cell membranes? An example pictured on the right?
Phospholipids
Which of the following proteins perform in accelerating the chemical reactions
that occur inside of all life? Enzymatic proteins
The cell is the simplest collection of matter that can live.
Cells are surrounded by membranes made of phospholipids “fabric” interwoven with
cholesterol and protein.
Scanning electron microscopes focus a beam of electrons onto the surface of a
specimen
~providing images that look 3d
Transmission electron microscopes focus a beam of electrons through a specimen
~ TEMS are used mainly to study the internal structure of cells
Cell fractionation: Takes cells apart and separates the major organelles from one
another
Ultracentrifuges fractionate cells into their component of cells
Cell fractionation enables scientists to determine the functions of organelles
Biochemistry and cytology help correlate cell function with structure.
6.2
Plasma membrane
~ the baggie containing everything else
Semi fluid substance called cytosol
~ goopy stuff
Chromosomes (carry genes)
~the library
Ribosomes (make proteins)
~the factory
Eukaryotic cells are characterized by having
1. DNA in a nucleus that is bounded by a membranous nuclear envelope.
2. Membrane bound organelles
3. Cytoplasm in the region between the plasma membrane and nucleus
The plasma membrane is a selective barrier that allows a lot of oxygen, nutrients and
waste to pass by.
A eukaryotic cell has an internal membrane that makes the cell into organelles.
The difference between plants and animals is that plants have a cell wall and green little
balls called chloroplasts. Animals don’t have that.
Pores regulate the entry and exit of molecules from the nucleus
The shape of the nucleus is maintained by the nuclear lamina, which is composed of
protein.
In the nucleus , DNA and protein form genetic material called chromatin
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