Bio Lab
if a pill bug travels 1cm in 2 minutes what is its rate of speed?
.5.. you must divide
low power objective
10 x long lens sued to view objects in greater detail
compound light microscope eyepiece - what is the magnifying power of the ocular lenses on your microscope?
10X
how many body divisions does a pill bug have?
3
high power objective
45x longest lens
what do you call the info scientists collect when doing experiments and making observations?
Data
which microscope shows an inverted picture?
compound light microscope
what step in the scientific method follows experiments and observations?
conclusion
what is a sample that goes through all the steps of an experiment and does not contain the factor being tested?
control
diaphragm
controls amount of illumination used to view the object
what is the final item placed on a wet mount before viewing with a light microscope
cover slip
cross section
cross wise cut through any type of specimen
which part of the microscope regulates the amount of light?
diaphram
a virus is 50nm in size. which type of microscope would you use to view it and why?
electro because it has higher magnification and allows you to see better
what type of object do you study with binocular dissecting microscope?
entire small objects
what are the ocular lenses?
eye pieces
what adjustment knob is used with high power?
fine adjustment
control
goes through all the steps of an experiment but lacks, or is not exposed to the factor being tested
stage
holds and supports microscope slides
body tube
holds nose piece at one end and eyepiece a the other end
binocular head
holds two eyepiece lenses that move to accommodate for the various distances between individuals eyes
resolution
is the minimum distance between two objects at which they can still be seen of resolved as two separate objects
coarse-adjustment knob
knob used to bring object into approximate focus used only with scanning and low power object
fine adjustment knob
knob used to bring object into final focus
longitudinal section
lengthwise cut through any type of specimen
condensor
lens system below the stage used to focus the beam of light on the object being viewed
a total magnification of 100x requires the use of 10x ocular lens with which objective?
low power objective
Conclusion
made based on the data collected, and tells us weather the observation supports the hypothesis or proves it false
can data prove a hypothesis true?
no
Explain the cycle of the Scientific Method
Observations- new are made and past data studied Hypothesis- a testable statement is formulated Experiment\observations- hypothesis tested by experiment or further observations Conclusion- results are analyzed -if hypothesis is supported continue work and conclude that many experiments and observations support a theory -if rejected- start again
parafocal
once the object is in focus with the lowest power, it should also be almost in focus with the higher power
what word is used to indicate that if the object is in focus at low power, it will also be in focus at high power?
parafocal
Scientific theory
a concept that ties together many varied conclusions into a generalized statement
magnification changing knob
a knob often built into the binocular head used to change magnification in both eyepieces simultaneously
focusing knob
a large black or gray knob located on the arm
focusing knob
a large black or gray knob located on the arm used for changing the focus of both eyepieces together
photomicrograph
a photograph of an image produced by a compound light microscope
what is proper way to view the meniscus?
at eye level
what does a pillbug do to protect itself?
balls up
why is a binocular dissecting microscope also called a stereo microscope?
because it produces 3D images
why is locating an object more difficult if you start with a high power objective rather than with the low-power objective?
because you want to see it as a whole when you put it under the microscope
what are the 3 parts located on a human epithelial cell?
plasma membrane, nucleus, cytoplasm
theory?
putting everything together in 1 generalized statement tested over and over again
compound
refers to the use of two sets of lenses: the ocular lenses located near the eyes and the objective lenses located near the object
nosepiece
revolving device that holds objectives
if euglena is swimming to the left which way would you move your slide to keep it in view?
right
which two types of microscopes view the surface of an object?
scanning and binocular
which objective always should be in place both when beginning to use the microscope and when putting it away
scanning power objective
metric system
standard system of measurement in the sciences
arm
supports upper parts
hypothesis
tentative explanation of observed phenomena. based on preliminary observations and previous data to formulate a hypothesis
scanning power objective
this is the shortest of the objective lenses = 4x
why is it important to use one substance at a time when testing a pillbug's reaction?
to ensure accurate results, and do not mix substances
which microscope resolves the greater amount of detail?
transmission
which 2 types of microscopes view objects that have been sliced and treated to improve contrast?
transmission and compound
mechanical stage control knobs
two knobs usually located below stage
eye piece lenses
two lenses located on the binocular head
illuminator
used to illuminate an object from above and may be built into the microscope or seperate
illuminator
used to illuminate an object from above, may be built into the microscope or separate
The data shows that vaccines protect people from disease. Hypothesis? Conclusion? Theory?
Conclusion because it is based on Data
Binocular dissecting microscope
(light microscope) designed to study entire objects in three dimensions in low magnification
compound light microscope
(light microscope) used for examining small of thinly sliced sections of objects under higher magnification than that of the binocular dissecting microscope
what are the 2 parts located on an onion epidermal?
Cell wall and nucleus
Metric System: put in order from largest to smallest: Nanometer, Centimeter, Meter, Micrometer, Millimeter
Meter, Centimeter, Millimeter, Micrometer, Nanometer
How is Scientific theory and conclusion different?
Scientific theory based on many experiments while a conclusion is based on 1 experiment
what part of pillbug is for protection?
Shell
all living things are made of cells. Hypothesis? Conclusion? Theory?
Theory because it is based on multiple experiments.. ALL living things
Which is more comprehensive? Conclusion or Theory?
Theory- based on many instead of one
mechanical stage
a stage with stage clips that can positioned using mechanical stage control knobs
light source
an attached lamp that directs a beam of light up through the object
scanning electron microscope
analogous to binocular dissecting light microscope. it gives an image of the surface and dimensions of an object as in apparent from the scanning electron micrograph
transmission electron microscope
analogous to the compound light microscope. object is ultra-thinly sliced and treated with heavy metal salts to provide contrast
Data
any factual information that can be observed either independently of, or as a result of an experimentation
base
the flat surface of the microscope that rests on the table
eye piece lenses
the two lenses located on the binocular head.