BIOLOGY 123 EXAM 1 WITH
COMPLETE SOLUTION
[Document subtitle]
[DATE]
[COMPANY NAME]
[Company address]
,Light Microscopes (LM)
The first microscopes visible as light passes through. Can magnify up to 1000X.
Electron Microscope
Uses a beam of electrons. Can magnify up to 100,000X.
Scanning electron Microscope (SEM)
Studies the detailed architecture of cell surfaces. Specimen must be coated in gold. Occurs in a vacuum.
Transmission Electron Microscope (TEM)
Study the details of internal cell structure. Specimen must be coated in gold. Occurs in a vacuum.
Cell size must
be large enough to house DEA, proteins and structures needed to survive and reproduce. However, must
remain small enough to allow for a surface to volume ratio that will allow adequate exchange with the
environment.
Plasma Membrane
forms a boundary between inside and outside a cell.
Phospholipids form a two-layer sheet called a phospholipid bilayer, what are they?
Hydrophilic - heads face outward (surrounded by water)
, Hydrophobic - tails point inward (towards each other)
Where are membrane proteins embedded
In the lipid bilayer.
What other functions do membrane proteins have?
Some form channels that shield ions and other hydrophilic molecules as they pass through the
hydrophobic center of the membrane.
Others serve as a pump to transport molecules into or out of the cell.
Prokaryotic cells are
Smaller and simpler in structure. Does not have a membrane that surrounds the DNA. DNA is coiled into
the nucleoid.
Eukaryotic cells
are distinguished by having a membrane enclosed organelles.
Cytosol
Interior filling of a cell which is a thick, jellylike fluid
What does a Eukaryotic cell contain?
a membrane enclosed nucleus, various other organelles (little organs) performing specific functions.
COMPLETE SOLUTION
[Document subtitle]
[DATE]
[COMPANY NAME]
[Company address]
,Light Microscopes (LM)
The first microscopes visible as light passes through. Can magnify up to 1000X.
Electron Microscope
Uses a beam of electrons. Can magnify up to 100,000X.
Scanning electron Microscope (SEM)
Studies the detailed architecture of cell surfaces. Specimen must be coated in gold. Occurs in a vacuum.
Transmission Electron Microscope (TEM)
Study the details of internal cell structure. Specimen must be coated in gold. Occurs in a vacuum.
Cell size must
be large enough to house DEA, proteins and structures needed to survive and reproduce. However, must
remain small enough to allow for a surface to volume ratio that will allow adequate exchange with the
environment.
Plasma Membrane
forms a boundary between inside and outside a cell.
Phospholipids form a two-layer sheet called a phospholipid bilayer, what are they?
Hydrophilic - heads face outward (surrounded by water)
, Hydrophobic - tails point inward (towards each other)
Where are membrane proteins embedded
In the lipid bilayer.
What other functions do membrane proteins have?
Some form channels that shield ions and other hydrophilic molecules as they pass through the
hydrophobic center of the membrane.
Others serve as a pump to transport molecules into or out of the cell.
Prokaryotic cells are
Smaller and simpler in structure. Does not have a membrane that surrounds the DNA. DNA is coiled into
the nucleoid.
Eukaryotic cells
are distinguished by having a membrane enclosed organelles.
Cytosol
Interior filling of a cell which is a thick, jellylike fluid
What does a Eukaryotic cell contain?
a membrane enclosed nucleus, various other organelles (little organs) performing specific functions.
