Elephants sometimes damage trees in Africa. It turns out that elephants dislike
bees. They recognize beehives in areas where they are common and avoid them. Can
this be used to keep elephants away from trees? A group in Kenya placed active
beehives in some trees and empty beehives in others. Will elephant damage be less in
trees with hives? Will even empty hives keep elephants away? Researchers want to
design an experiment to answer these questions using 70 acacia trees.
a. Identify the experimental units, treatments, and the response variable.

b. Describe how the researchers could carry out a completely randomized design for
this experiment. Include a description of how the treatments should be assigned.

Thin layer chromatography in the organic chemistry typically uses a glass plate coated with silica gel, which serves as the stationary phase. The mobile phase in the experiment is an organic solvent or mixture of organic solvents. The mobile phase pulls the organic material(s) being analyzed up the plate by dissolving them in the solution. So, the more something dissolves in the mobile phase the further up the plate it moves. The mobile phase in this experiment will involve which materials?

Select one:

Hexanes and Ethyl Acetate

Silica Gel

Ethyl Alcohol

Water

Ethanol and Water

Water and Ethyl Acetate

Hexanes

Ethyl Acetate

This is a trick question because the mobile phase evaporates and is therefore not important.

Find an article in a newspaper or magazine (or the online equivalent) describing a recent study in which the researchers collected data through observation or an experiment to draw a conclusion. A simple poll (like “43% of Americans like to eat sushi”) is not sufficient; you should be looking for something describing a significant research study. Some examples (don’t limit yourself to these): an experiment testing a new drug or medical procedure a study linking a food or exercise with causing or reducing the risk of a disease a study about how some new teaching approach improves learning a study about how people behave (example: a study showing incentives can cause us to be less efficient)

In an experiment, E.coli cells have been genetically modified through site directed mutagenesis. This is a process through which specific locations in an organism’s genome can be altered in order to study the function of such locations, or proteins coded for by genes found in a location. There are many techniques available for site directed mutagenesis. (You have access to PCR ingredients, any primer you wish, laboratory equipment, Lambda phage, and the ability to alter Lambda genome, a commercially available plasmid, such as Puc19, E.coli K-12, plates, media, etc..)

1. Design an experiment where you can synthesize an altered origin of replication of your target cell in-vitro.(4 points)

1. A forester in Vanderhoof, B.C., needs to run a tree growth experiment to understand the effect of brushing (removing unwanted non-commercial tree species that can compete for moisture, nutrients, and sunlight) on the growth of commercially valuable balsam, fir, pine, and spruce trees from seedlings started in the research nursery. Available to her are sixteen different experimental plots northwest of Vanderhoof. Design an experiment for her. (Sec. 3.2)

1. State the response variable.

2. State the number of factors and levels per factor are in your design.

3. How is repetition achieved in your design?

4. How do you use randomization in your design to control for the effects of lurking variables?

5. Sketch a layout of the factors and levels.

please answer all the questions for microbiology :
1. Be able to draw and/or identify general bacterial cell shapes and cell organizations

2. Know how to do a streak for isolation, and a spread plate and why you would do each

3. how to do a Gram stain, Endospore stain and acid fast stain and why you would do each.

4. Know the tools of the microbiologist and what they are used for

5. Be able to explain the results of the hand-wash experiment

6. Be able to identify and describe the results of the antiseptics/disinfectants, antibiotics experiment and interpret the results

7. Know what aseptic technique is and how to exhibit aseptic technique

a) Show the full balanced equation of Benzaldehyde + Sodium Cyanide -> Benzoin. Stoichiometry ratio should be 2:1. Ratio of -CN to benzoic is 1:1 if that even helps. Rely on Sodium Cyanide being 0.54M in 95% Ethanol. b) Use the density of benzaldehyde to calculate its mass. 400 microliters were used in my experiment, and the MW is 106.13. C) Thus, Find the Limiting Reagent, Theoretical yield, and % Yield of Benzoin. Obtained yield in experiment was .0246g benzoin crystals, and again, 400microliters of benzaldehyde used AND 4mL of Sodium Cyanide (0.54M in95% ethanol) was used. PLEASE SHOW NICE LEGIBLE WORK SO I CAN UNDERSTAND WHAT IS GOING ON.

A researcher would like to determine if relaxation training will affect the number of headaches for chronic headache sufferers. For a week prior to training, each participant records the number of headaches suffered. Participants then receive relaxation training and for the week following training the number of headaches is again measured. (18 points) The data are as follows: MD = 2.25, s = 1.28

a)      What is the null hypothesis for this experiment?

b)      What is the alternative hypothesis for this experiment?

c)      Calculate the appropriate test statistic to test the hypothesis- show your work

d)      What is the critical value if alpha is set to .05?

e)      What is the conclusion? State in words whether we reject or fail to reject the null hypothesis and why.

Consider an experiment in which a random family is selected among all families with exactly two children of which one is known to be a girl.

a. Write out the sample space and state the probability that the selected family has two girls.

b. Now consider an experiment in which we select a family randomly among all families with exactly two children, of which one is known to be a girl born on Tuesday. Write out the entire sample space taking into account the gender of the children and the day of the week they were born on.

c. What is the probability that the selected family has two girls?

d. Are the variables “day of the week” and “gender of child” dependent or independent?

The response time (in seconds) was determined for three different types of circuits that could be used in an automatic valve shutdown mechanism. The results are provided in the table below:

Construct a set of orthogonal contrasts, assuming that at the outset of the experiment you suspected the response time of circuit type 2 to be different from the other two. ii. If you wished to minimize the response time, which circuit type would you select? iii. Analyse the residuals from this experiment and comment on whether the assumptions of analysis of variance are satisfied.