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Biology 1107 Lab Quizzes/midterm
Terms in this set (68)
In general, a measuring device should not be used to measure ____________.
less than 50% of its maximum measuring capacity.
Accuracy is the degree to which
an observed value corresponds to a true value.
Each micropipette has a multiple stop plunger: the first stop is designed to ________ the volume that has been dialed in; the second stop is designed to _______ the entire volume of air behind the liquid to ensure complete delivery; the third stop is used to __________.
pick up; deliver; eject the tip
The basic unit of the metric system is
A number is expressed in scientific notation when it is written as a product of a decimal number between
1 and 9
The scale on a TD delivery pipet the scale _________________ while the scale on the TD blow out pipet _________________________.
stops before it narrows; runs to the tip
The density of water is
1mml of water weights 1 gram
What materials should you use when cleaning the lens of a microscope?
Cotton swabs and lens cleaner
Which of the following are differences between a compound light microscope and a dissecting microscope? Choose all that apply.
Compound light microscopes are used with thin specimens while dissecting microscopes can be used with thicker specimens.
Compound light microscopes have multiple lenses called objectives while dissecting microscopes have only one objective lens
What does the resolving power of a microscope refer to?
Identify the follow numbers that would be found on a compound light objective lens
the ability to distinguish between two points
Sudan IV is used to test for which of the following types of molecules?
Which of the following molecules would show a positive response with Benedict's reagent?
In an experiment you set up three test tubes; one with water and the reagent, one with a molecule known to react with the reagent, and one with an unknown. The tube with water and the reagent is
In an experiment you set up three test tubes; one with water and the reagent, one with a molecule known to react with the reagent, and one with an unknown. The tube with a molecule known to react with the reagent and the reagent is
Monosaccharaides are classified based on
the number of carbon atoms they contain.
Proteins are polymers of
amino acids joined by peptide bonds
Lipids are classified together based on
their lack of solubility in water
The molecule that you are testing in this lab is
The molecule that acts as the reagent in this lab is
When preparing a serial dilution you make the third solution using
the second solution
One mole of any substance is equal to
the graph molecular weight of that substance
What's the measuring capacity of the balance?
410g pls/minus 0.01
the balance is set to zero with a tare knob or button after the container is placed on the balance pan. The mass recorded after reflects on the mass of the sample
What's the 50% rule?
A measuring device should not be used to measure volumes that are less than 50% of its maximum measuring capacity.
What are the two types of TD pipets?
delivery and blow out
The blue pipet aid is designed to be used with
1ml pipets only
You will always use a popet aid to dispense volumes between
1 and 10 ml
You will NEVER _________ by mouth
What's the density of water?
In the micropipettes, the first stop is calibrated to
pick up the volume that has been dialed in
In the micropipettes, the second stop is designed to
deliver the entire volume of air behind the liquid to ensure complete delivery
In the micropipettes, the third stop is used to eject the
how close your values are to the true value
how close your values are to each other when repeated
How much magnification does a dissecting microscope allow?
10 to 45 times
Is the material observed under a DS microscope thick or thin? Is it used to observe large or small organisms?
How many eye pieces of a DS microscope have? HOw much does it objectify?
Compound Light Microscopes are used if you want to observe _______ and ________ specimens
smaller and thinner
Compound Light Microscopes have ____________ powers of magnification than the dissecting scope.
Simple Light MS - lenses?
Compound Light MS
uses set of lenses or lens systems
Compound MS- mechanial parts?
used to support and adjust
Compound MS- magnifying parts?
Low Power Objective- gives lowest magnification of 10x
High Power Objective- mag of 40x or 43x
Oil Immersion- highest mag. usually 97x or 100x uses with oil
Compound MS- illuminating parts
used to provide light
Compound MS- base
bottom most portion that support
Compound MS- revolving nosepiece
rotating disc where the objects are attached
Compound MS-coarse adjustment knob
geared to the body tube which elevates or lowers when rotated bringing the object into approximate focus
Compound MS- fine adjustment knob
a smaller knob for delicate focusing bringing the object into perfect focus
Compound MS-iris diaphragm lever
lever in front of condenser and which is moved horizontally to open/close the diaphram
Compound MS- condenser adjustment knob
secures the specimen regulate the intensity of light
Compound MS- iris diaphragm
regulates the amount of light necessary to obtain a clearer view of the object
Compound MS- condenser
a set of lenses between the mirror and the stage that concentrates light rays on the specimen
Compound MS- ocular/eyepiece
another set of lens found on top of body tube which functions to further magnify the image produced by the objective lenses. ranges for 5x to 15x
double bonded oxygen in the carbonyl group will react with copper in benedicts regent to form a _______ colored precipiatate (reducing sugar)
larger more complex polysaccs like starch,glycogen and cellulose ______ react with benedicts regent
I2KI, what color does it change in the presence of polysacc but not the presence of mono or disaccharides?
Are lipids soluble in water?
Sudan IV dissolves in substances like ______. If triglycerdies are not present the Sudan IV will ______ as thin layer on top
fats and oils;float
THIS SET IS OFTEN IN FOLDERS WITH...
BIO 1107 Lab Exam 1
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