Biology homework help.
stion 1 (0.08 points)
True or False: Good experimental design recommends having a large number of subjects for each test group.Question 1 options:TrueFalse
Question 2 (0.08 points)
True or False: Individual variability in test groups can be eliminated after performing the experiment.Question 2 options:TrueFalse
Question 3 (0.08 points)
True or False: The variability in the responses of test group is reduced by choosing subjects that are similar to each other.Question 3 options:TrueFalse
Question 4 (0.08 points)
True or False: A negative control will check for the viability of the reagents or chemicals.Question 4 options:TrueFalse
Question 5 (0.081 points)
True or False: The negative control determines whether the reagents or chemicals used in a test are contaminated.Question 5 options:TrueFalse
Question 6 (0.08 points)
True or False: A positive control determines if all of the reagents or chemicals used in a test are working well.Question 6 options:TrueFalse
Question 7 (0.08 points)
True or False: A false negative result may emerge from a test that lacks sensitivity.Question 7 options:TrueFalse
Question 8 (0.08 points)
True or False: A false positive result may emerge from a test that lacks selectivity.Question 8 options:TrueFalse
Question 9 (0.08 points)
True or False: When graphing experimental data, it is customary to place the dependent variable on the x-axis and the independent variable on the y-axis.Question 9 options:TrueFalse
Question 10 (0.08 points)
True or False: Data within two standard deviations (std dev) of the mean accounts for 95.5% of the responses in a population.Question 10 options:TrueFalse
Question 11 (0.08 points)
Clarissa is trying to develop a sweeter apple that contains more fructose by feeding her trees her homemade compost. After harvesting apples from the regular trees and the ones treated with the special compost, she is ready to check their fructose content. In order to assure that her test results are reliable, she should include the following in her analysis.Question 11 options:A solution with water only and another solution with fructose only.Several solutions with different amounts of fructose.Several solutions with different amounts of water.She is sending them off to a professional lab for the analysis so she should not worry about how the tests are performed.
Question 12 (0.08 points)
The local STD clinic tests for gonorrhea, a sexual transmitted disease, and the test takes two weeks to conduct. The lab analysis involves testing a known sample that contains gonorrhea. Is this necessary?Question 12 options:This is pointless because having this sample may cross-contaminate the real test samples.This is pointless, but the clinic uses this to justify their expensive fees compared to other nearby clinics.This assures the technicians that their reagents are in working order, and adds credibility to the test results.This assures the technicians that their reagents will expire and adds credibility to the test results.
Question 13 (0.08 points)
Define “mean” in statistics:Question 13 options:The difference between the largest and smallest number (or score).The middle number (or score) of all the numbers.The most frequently occurring number (or score).The average of a set of numbers (or score).
Question 14 (0.08 points)
Define “range” in statistics:Question 14 options:The difference between the largest and smallest number or score.The middle number or score of all the numbers.The most frequently occurring number or score.The average of a set of numbers.
Question 15 (0.08 points)
Archaeologists study the remains of organisms that lived many hundred, thousands and millions of years ago. Despite the absence of any living samples to study, they still implement the scientific method in their work. Thus, to answer questions they formulate hypothesis, which is similar to which of the following?Question 15 options:Creating a testable question.Forming a theoretical argument.Crafting a well-formed opinion.None of the above.
Question 16 (0.08 points)
A farmer is curious about a new type of genetically modified corn that presumably grows faster and larger than their current variety. Before purchasing this new and very expensive genetically modified corn, the farmer asks for three-dozen kernels (i.e., seeds) of this new corn to test on his land. Why would the farmer want to test so many kernels of the new corn when one kernel should be fine for comparative purposes?Question 16 options:The farmer should test only two kernels of the new corn for comparative purposes.It will be enough for the farmer to test one kernel of the new corn and one kernel of the old corn grown side-by-side.The farmer should test all three-dozen kernels of the new corn along with an equal number of the old corn together and grow them side-by-side.The farmer should test all the new kernels alone in his greenhouse over the winter before purchasing them.
Question 17 (0.08 points)
When you are performing an experiment to test a hypothesis, is it best to test two variables at once?Question 17 options:This is true because there will be less work to do over time.The ideal situation is to have as many variables as possible in order to come a more definitive conclusion about the experiment.This is correct as long as there is a positive and negative control for each variable being tested.The ideal situation is to test only one variable at a time and hold all other components constant.
Question 18 (0.08 points)
Evaluate this statement: The number of subjects in control and test groups is determined by the type of experiment.Question 18 options:This is the ideal situation because of the scope of each experiment always determines the size of the test group.Ideally, a largest possible number of subjects in the tests groups is preferred because that reduces the variation in the final result.The ideal situation is to keep the number of subjects in a group to a minimum because that will simplify the statistical analysis of the data.Having a large number of subjects in the test group is unnecessary because that does not affect the statistical analysis of the data.
Question 19 (0.08 points)
Mary Ellen has been trying to get pregnant for 6 months now. Last week she found out she was pregnant using a home pregnancy test. However, a more sophisticated, follow-up test at her doctor’s office a few days later said otherwise, and she is not pregnant. How would you describe the results of the home pregnancy test?Question 19 options:Those were false negative results.Those were false positive results.Those were negative control results.Those were positive control results.
Question 20 (0.08 points)
The following statement best reflects what part of the scientific method. Statement: Plants will grow faster in soil that contains fertilizer before you plant seeds.Question 20 options:Test of hypothesisState the hypothesisState the resultsState the conclusion
Question 21 (0.08 points)
The following statement best reflects what part of the scientific method. Statement: The experiment shows that 70%-80% of children who ate sugary candy developed more cavities or experienced more tooth decay compared to those children who mostly ate sugar-free candy.Question 21 options:Test of hypothesisState the hypothesisState the resultsState the conclusion
Question 22 (0.08 points)
The following statement best reflects what part of the scientific method. Statement: If the acidified lake water affects plants, then it may also affect small animals in the lake as well.Question 22 options:Test of hypothesisState the hypothesisState the resultsState the conclusion
Question 23 (0.08 points)
The following statement best reflects what part of the scientific method. Statement: The effect growing plants in blue light or yellow light on two different types of plants showed an effect of light color on plant growth.Question 23 options:Test of hypothesisState the hypothesisState the resultsState the conclusion
Question 24 (0.08 points)
The following statement best reflects what part of the scientific method. Statement: The data shows that morphine is not as effective a painkiller in individuals with red hair compared to brunettes and blonds.Question 24 options:Test of hypothesisState the hypothesisState the resultsState the conclusion
Question 25 (0.08 points)
The following statement best reflects what part of the scientific method. Statement: Michael noticed that molds collected from his basement were better 75% more effective at killing bacteria in a cell culture compared to molds collected outside in his yard.Question 25 options:Test of hypothesisState the hypothesisState the resultsState the conclusion 4 of 25 questions saved
What is the magnification of a specimen on the microscope when viewed with a 5X ocular lens and an objective lens of 10X, 20X and 100X?Question 1 options:2X, 4X and 20X, respectively 5X, 10X and 50X, respectively ,10X, 20X and 100X, respectively 50X, 100X and 500X, respectively500X, 1,000X and 5,000X, respectively
Question 2(1 point)
What settings on the microscope control the amount of light shining on the specimen? Question 2 options:Objective lens and stage levelCoarse and fine focus knobs Iris diaphragm and fine focus knobIris diaphragm and light switchLight switch and stage level
Question3 (1 point)
How does the specimen’s orientation on the microscope’s stage compare to its orientation at the level of the eyepiece?Question 3 options:The magnified specimen seen at the level of the eyepiece is 90˚ clockwise relative to the image on the stage.The magnified specimen seen at the level of the eyepiece is 90˚ counter-clockwise relative to the image on the stage.The magnified specimen seen at the level of the eyepiece is inverted on both horizontal and vertical axes relative to the image on the stage.The magnified specimen seen at the level of the eyepiece is the same orientation as the image on the stage.The magnified specimen seen at the level of the eyepiece is 270˚ clockwise relative to the image on the stage.
Question 4 (1 point)
What setting on the microscope is adjusted to focus the specimen when looking into the eyepiece for the first time.Question 4 options:Objective lensCoarse focus knobFine focus knob40X PowerLight switch
Question 5 (1 point)
What is the function of the iris diaphragm on a microscope?Question 5 options:Holds the ocular lenses.Regulates the amount of light the specimen receives.Moves the pointer in the ocular lens.Moves the stage up and down.Holds and moves all the objective lenses.
Question 6 (1 point)
From the following options, what is done first to view a specimen under the microscope?Question 6 options:Adjust the ocular lensAdjust the objective lensAdjust the fine focus knobMove the specimen on the stage to the center of the field that has light passing through it.Start viewing the specimen with the lowest objective magnification.
Question 7 (1 point)
Which of the following settings is adjusted on the microscope when the specimen is viewed at increasing magnification as the objective lens is changed from 4X to 10 X to 40X?Question 7 options:Objective lensCoarse focus knobFine focus knob40X PowerStage
Question 8 (1 point)
On the microscope, what holds the slide containing the specimen?Question 8 options:Objective lensCoarse focus knobFine focus knob40X PowerStage
Question 9(1 point)
What do you do when you see hollow, dark circles in your field of view with a wet mount specimen?Question 9 options:Adjust the iris to permit more light onto the specimen.Lift the cover slip and gently lower it at a 45˚ angle, or remount the specimen to eliminate the air bubbles.Clean the dirty cover-slip or get a new one.Get a new specimen to view.Lower the stage.
Question (1 point)
How do carry a compound microscope if you moving it from one location to another?Question 10 options:Only grab the hand and do not touch the base for fear of damaging the light bulb that lights the specimen.Grab either the arm or the base to move the microscope.Use two hands. Grab the arm with one hand and the base with the other hand.Remove the objective lens compartment before physically moving the microscope from one location to another.Grab the eyepiece with one hand and the base with the other hand.