lab quiz 1
cross section
a crosswise cut through any type of specimen
longitudinal section
a lengthwise cut through any type of specimen
light source
an attached lamp that directs a beam of light through the object
If threads are layered from top to bottom, brown, green, red, which layer will come into focus first if you are using the microscope properly?
brown
stereomicroscope
dissecting microscope - examines the entire object in three dimensions at low magnification
compound light micrsope
examines small or thinly slicked sections of objects under high magnification
scanning electron microscope
gives an image of the surface and dimensions of an object
binocular head
holds two eyepiece lenses that move to accommodate for the various distances between different individuals eyes
focusing knob
large knob, used for changing the focus of both eyepieces together
To properly measure 20 ml of water, what must be at the 20 ml mark of the graduated cylinder?
meniscus
total magnification
ocular lens X objective lens
What kind of microscope would be used to study a whole or opaque object?
scanning
which objective should be in place when the microscope is put away?
scanning
base
the flat surface of the microscope that rests on the table
If the amount of light passing through the condenser needs to be decreased, what microscope part should be adjusted?
Diaphragm
if a slide is being viewed with the high-power objective, which adjustment knob should be used to sharpen the focus?
Fine Adjustment
A
L x W
V
L x W x H
Justify your choice of an objective to use when starting your observation of the Euglena wet mount; if the Euglena are swimming to the left, which way should you move your slide to keep the organism in view?
Scanning, Right
resolution
the minimum distance between two objects
metric system
the standard system of measurement in the sciences, including biology, chemistry, and physics
Which type of microscope should be used to view a virus that is 50 nm in size? Justify your choice
transmission electron
eyepiece lenses
two lenses located on the binocular
transmission electron microscope
ultra-thinly sliced and treated with heavy metal salts
magnification changing knob
used to change the magnification in both eyepieces
illuminator
used to illuminate an object from above
90 degrees Fahrenheit equals how many degrees Celsius
33
3.41 equals how many ml?
3410
If the total magnification of a slide is 400 X and the ocular lenses are 10X, what is the magnifying power of the objective being used?
40
What word describes a microscope that remains in focus when the objective lenses are changed?
Parafocal
880 mm equals how many m?
.880
19 mm equals how many cm?
1.9
1 meter
100 cm = 1,000 mm = 100,000µm = 1000,000,000 nm
1 G
1000 mg = 1000,000µg = 1000,000,000 ng
1L
1000ml = 1000,000µl = 1000,000,000 nl
2,700 mg equals how many grams?
2.7g
If you use the coarse-adjustment knob to focus on an object with the high power objective, what problems will you encounter? Explain.
Break the circle
condenser
CL - lens system below the stage used to focus the beam of light on the objective being viewed
stage
CL - platform that holds and supports microscope slides
nosepiece
CL - revolving device that holds objectives
arm
CL - supports upper parts and provides carrying handle
viewing head
CL - holds the ocular lenses
diaphragm
CL - lever that controls the amount of light passing through the condenser
scanning objective
CL - shortest of the objective lenses, used to scan the whole slide
What is the name for the lenses located near the eye?
Ocular lenses