Biology, Cells, Q1
cell theory
each cell possesses a life of its own
Galileo used mathematics to
examine the principles of lenses, thus improving on previous attempts at magnification
Anton van Leeuwenhoek
first to carefully document observations of blood cells, sperm cells, and other microorganisms
Robert Hooke
first to observe "small chambers" in cork and call them cells.
organism
functional plant or animal
organismal theory
a functioning organism represents life
electron microscope
a microscope that focuses a stream of electrons to magnify objects
as it occurs in a microscope 2nd
body tube
the Bible states that man was created in the image of God and is therefore
far more than just a collection of cells that make up his body
ocular lens
lens found in the eyepiece
the spherical object within a cell which controls its activity is called the
nucleus
nucleus
Control center of the cell
vacuole
A large sac-like storage area in a cell
optical microscope
A microscope that uses visible light and lenses to magnify objects.
resolving power
ability to tell two points apart
cytoplasm
all cellular material outside the nucleus
plasma membrane
Controls what enters and leaves the cell
Max Knott and Ernst Ruska
Germans who invented the electron microscope in the 1930's
the Organismal Theory states
the organism is the basic unit of life
life cannot be completely defined by
the physical sciences
binocular
two eyepieces
ESSAY explain three disadvantages to using an electron microscope to view microorganisms
very expensive, extensive and time consuming specimen preparation, and you can not view a living organism.
epidermis
an outer covering of cells
ESSAY what safety measures should you take to avoid damaging the microscope, microscope slide, or a living specimen on your microscope stage
look at the specimen from the side, not through the eyepiece when you are turning the low power objective as close as possible to the specimen to begin your observations. never use the coarse adjustment knob while using the high power objective. never turn the fine adjustment knob more than a fourth turn to adjust the focus while using the high power objective.
as it occurs in a microscope 3rd
revolving nosepiece
Charles Spencer
an American who was able to significantly improve the quality of the magnified images with his microscopes
as it occurs in a microscope 5th
coverslip
the cellular material outside the nucleus is called
cytoplasm
Schleiden and Schwann
developed the cell theory
objective lens
magnifying lens closest to the specimen
as it occurs in a microscope 4th
objective lens
as it occurs in a microscope 1st
ocular lens
the Bible teaches that
our bodies were created, then had life breathed into them
cell wall
outer covering around plant cell made of fibrous material
monocular
single body tube
Hans and Zaccharias Janssen
sixteenth century eyeglass makers, experimented with glass lenses and a tube and found that object could be magnified greatly
nucleolus
small structures within nucleus
one difference between human cheek cells and onion cells
the absence of a cell wall in human cells
Cell theory states
the cell is the basic unit of life
