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.