BiologyLab Midterm
14 millimeters corresponds to __ centimeters.
1.4
58.6 centimeters corresponds to __ millimeters.
586
Which type of appendage is used by the pillbug to explore its environment?
Antennae
Reusable dissection instruments or glass tube that requires sterilization should be placed in the
Autoclave
A wet mount is time consuming.
False
You decide to test your pillbugs' preference for an acidic environment versus a non-acidic environment. On one side of the chamber you place filter paper moistened with water. What is the appropriate to place on the other side to test this variable?
Filter paper moistened with Vinegar
Let's say you are testing a pillbug's reaction to baking soda. What substance would you choose as a control?
Fine Sand
What parts of the microscope move? Select all that apply.
Focus Knob Stage Nosepiece
What do you do in the LabSmart's hypothesis phase? Select all that apply.
Formulate Hypothesis Make a strategy for the experiment
When should the lab bench be cleaned and disinfected? Check all that apply.
Prior to lab activity After completing the lab activity
Which type of eukaryotic unicellular organisms are more animal like in that they lack a cell wall and obtain nutrients by engulfing food particles?
Protozoa
What items should be disposed of in the sharps container? Select all that apply.
Razor Blades Scalpel Blades Broken Glass Pipettes
What do you do in each of the four phases
Report- document your results and compose a report Experiment- Carry out the strategy and make measurements Analysis- draw graphs, evaluate hypothesis Hypothesis- create strategy, format hypothesis
How do pillbugs detect the presence of food?
Smell
Suppose your hypothesis is "The braking distance grows linearly with speed". Which factor will you vary in order to test the hypothesis?
Speed
Suppose your hypothesis is "braking distance grows linearly with speed". What is the independent variable?
Speed
The functions of lipids include which of the following? Select all that apply
Storage of energy Construction of Membranes
In order to be of scientific value, it is importnat that a hypothesis be ____.
Testable
Which of the following are functions of proteins? Select all that apply.
They can be for signaling The can play role in the immune system They can be structural They act as catalyst
Soap should always be applied to __ hands
Wet
The __ __ preparation allows one to observe the behavior and movement of microorganisms with a light microscope. (two words)
Wet Mount
Which question can you ask yourself to determine the dependent variable of an experiment?
What will I measure
A good scientific experiment is reproducible. What does that mean?
anyone can conduct the same experiment in another lab and expect to get the same results
Which of the following does a lab coat protect against? Select all that apply
corrosive chemicals infectious microbes
As you view a specimen on higher magnification, the amount of the slide seen in the field of view __,
decreases
The weight to volume ratio of a substance describes which physical property?
density
Scientific results that have undergone tests are (select all that apply)
reproducible systematic
How many cubic centimeters is 1 milliliter?
1
What is lens paper used for?
it is used to remove oil from the lens after viewing under oil immersion
When a pillbug is placed in a choice chapter, which of the following behaviors indicates a preference for a particular substance?
it spends more time in the chamber with the test substance
Approximately how many quarts of soda are in a 2 liter bottle?
2
How long should you scrub your hands with soap before rinsing?
20 seconds
1 cup corresponds to approximately __ mL.
240
Room temperature water is often described as tepid or lukewarm. A Celsius thermometer placed in room temperature water should record approximately which temperature?
25 degrees C
2584 centimeters corresponds to __ meters.
25.84
How many feet does 1 meter roughly correspond to?
3
1 ounce corresponds to approximately __ .
30mL
At what temperature on the Fahrenheit scale does water freeze?
32 degrees F
Normal body temperature when taken orally is about 98.6 degrees Fahrenheit. If you used a Celsius thermometer, what would the reading be?
37 degrees C
Which lens could get dirty with oil if you move the revolving nosepiece in the wrong direction after viewing under oil immersion?
40X
The thermometer on a sign indicates that it is 20 degrees C outside. What is it in Fahrenheit?
68 Degrees F
How many pairs of legs does a pillbug have?
7
If you are testing the effects of an experimental variable that is a colorless, odorless liquid, which should you choose as your control.
A liquid like plain water
All laboratory chemicals can be poured down the sink?
False
T or F If you sustain a small cut in the lab, there is no need to notify the lab instructor?
False
T or F. Due to their small size, all plant and animal cells must be visualized using electron microscopy.
False
T or F. Hand washing is not necessary if gloves have been worn?
False
What are the advantages of using a wet mount? Select all that apply.
The specimen can be viewed as living cells The motility of a specimen can be viewed under the microscope
Prior to the cheek epithelial smear, what should be sanitized?
Toothpick
During which of the following lab activities is it most important to tie back long hair?
Using a Bunsen Burner
When should hands be washed? Select all that apply.
anytime hands are potentially contaminated after the lab exercise Prior to the lab exercise
What should your hypothesis represent?
an explanation to a problem or observation
Which of the following determines the quality and clarity of the microscope image? Select all that apply.
Magnification Contrast Resolve Power
When measuring volume, which system of measurement is most accurate?
Metric System
Which of the following approaches to the study of organisms enables direct viewing of the cells?
Microscopic
Which distance is greater, a kilometer or a mile?
Mile
Which type of environment is necessary for optimal respiration in pillbugs?
Moist, Damp
How are the metric units of measurement different that the standard system used in the U.S.? Select all that apply.
metric units are based on multiplies of 10 the metric system is used in more countries world wide
Which of the following should be done first in the event of a laboratory accident?
notify the instructor
Why is it important to perform an experiment with a control?
without a control, a negative test could have been explained by some other factor causing a false positive
When is it important to wear gloves in the lab? Select all that apply.
working with sterile mammalian cells disections working with toxic chemicals
Infectious agents in the laboratory are classified into four _____ levels based on their ease of transmission and ability to cause disease.
Bio Safety
The epidermal cells of an onion are found on the __ of each layer.
Inside
Which topics belong in a scientific paper? Select all that apply.
Introductions, Procedures and results
Why is it important to use the tare function when weighing an object on paper or in a beaker?
It allows you to get the weight of the object and not the container
How does the pillbug react when confronted with a noxious substance?
It moves away
In which of the following situations would you use the fume hood?
Working with hazardous chemicals
When is a lab coat necessary?
You Should always wear a lab coat
What is a towel used for in the hand washing process? Select all that apply
dry off hands after scrubbing and rinsing Turn off Faucet
What is the purpose of wearing gloves? (Select all that apply)
to protect your experiment from bacteria on your hands to protect yourself from infection of an open wound to protect yourself from chemicals in the environment
You have successfully focused an object at the edge of the field fo view under low power magnification You rotate to the 40x objective lens and increase illumination, but dont see the object. What is the most likely solution?
under low power, center the object to be viewed before switching to high power
What is more important, to choose the correct hypothesis or to test the hypothesis well?
The right test is more important
How many pounds are in 1 gram?
.0022lbs
Which is heavier, 1 gram or 1 pound?
1 Pound
Match the steps of performing a cheek cell smear.
1) Gently scrape the inside of the cheek 2) Place scrapings on clean, dry slide 3) add one drop of stain 4) cover with coverslip
Put the steps of wet mount preparation in order.
1) Obtain a clean slide and cover slip 2) Using a transfer Pipette, obtain a drop of specimen and place it in the center of the slide 3) Carefully place the coverslip over the drop of the specimen 4) Observe the Preparation under 10X objective lens 5)Observe the Preparation unde 40X objective lens
dicate the correct order of steps as you bring an object into focus under high power.
1) place slide of stage & secure with clip 2)Center the specimen over the light source 3)focus specimen on low power using coarse adjustment 4) focus specimen with fine focus on low power to sharpen image 5) rotate to high power lens 6) readjust using fine focus while on high power to produce sharp image
After they are used, reusable instruments or glassware that require sterilization should be placed in the
Autoclave
In the example where the hypothesis is "The braking distance grows linearly with the speed", what should go on the y-axis?
Braking Distance
Which of the following structures is present in animal cells but not plant cells?
Centrioles
Select all of the necessary items for making a wet mount.
Cover Slip Pipette Clean Slide
Which of the following statements is correct? A) It is ok to modify lab procedures if you have carefully read it and have a way to do it more quickly B) food may be consumed in lab as long as the bench is wiped down and hands are washed C) It is fine to use your cell phone for calculations in lab as long as you are wearing gloves D) Make up and contact lenses should not be applied in lab
D
Which best describes the pillbug's organ of respiration?
Gills
What should be removed before washing your hands? Select all that apply.
Gloves Hand or wrist jewelry watch
The total magnification of an image is determined by __ the magnification power of the ocular lens and the magnification of the objective lens.
Multiplying
When can food or beverages be brought into the lab?
Never
Which of the following are found in both plant and animal cells?
Nuclei
Which best describes the diet of pillbugs?
Omnivore
Where are the pill bugs organs of smell?
On the Antennae
Information about hazards posed by chemicals used in the lab can consistently be found
On the Materials safety data sheet
When preparing your experiment, how many substances or conditions should you test at a time?
One
Which of the following is the definition of the prefix "milli"?
One Thousandth
In which type of emergency would you utilize the safety shower?
Removing a large volume of chemicals from your body
Of the following, what comes first in the hand washing process?
Running hands under water
How should a subject be chosen to be part of a control group or an experimental group?
Selection should be random
Slides, scalpels, razor blades, cover glasses and capillary tubes are classified as
Sharps
Which of the following techniques can be used to view living specimens? Select all that apply.
Simple Stain Wet Mount
A dense object will be characterized by which of the following?
Small Volume and high weight
Which of the following techniques is used to increase the contrast of a microscope sample so that cellular components and details can be observed?
Staining
When you measure the diameter of a circle, which length are you measuring?
along a line dividing the circle in half at its widest poinit
