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1. Should the G0 (this is zero subscript) phase be a regular part of the cell cycle? Why or why not?
2. Can restoring the cell cycle checkpoints address cancer?
A student reads in a newspaper that the soil in his area contains high levels of arsenic. Based on this information, he believes that his fellow high school classmates have this metal present in their bodies. To test his hypothesis, he conducts an investigation of the soil in his schoolyard to see if it is contaminated with arsenic. He tests seven different areas around the school and finds high levels of arsenic in each. He concludes that the students at the school must have high levels of arsenic in their systems as well. Which of these is the best evaluation of his conclusion?
A.
His conclusion is valid because he tested enough areas of soil to validate his hypothesis.
B.
His conclusion is flawed because he did not test the soil at the homes where the students lived.
C.
His conclusion is valid because arsenic is a toxic metal and is easily absorbed by the human body.
D.
His conclusion is flawed because he did not test the students to see if their bodies contained metal arsenic.
A.
His conclusion is valid because he tested enough areas of soil to validate his hypothesis.
B.
His conclusion is flawed because he did not test the soil at the homes where the students lived.
C.
His conclusion is valid because arsenic is a toxic metal and is easily absorbed by the human body.
D.
His conclusion is flawed because he did not test the students to see if their bodies contained metal arsenic.
What is the correct events for secondary succession?
Describe the different organ systems
How do you work out the compound formula of NaC1, KCI, NaHPO, KHPO for molecular mass, mass of compound, molar concentration
The pH of a solution describes its acidity or alkalinity: Describe how pH and H3O+ concentration are related and explain why diluting an acid raises the pH, but diluting a base lowers the pH.
, describe how you would prepare 1 litre of 1x working solution PBS, including which glassware you would use. Will you need to adjust the pH again?
During paleontological study, scientist found 100 year old pollen grain trapped in the soil. Name the chemicals which made it survive for such a long period of time.
Sophia is testing an effect of different volumes of water on the growth of duckweed. She set up the experiment that is shown below.
Three beakers, all the same size, are set up with cool tap water and duckweed in them. The first beaker contains 100 mL of water and 20 fronds of duckweed. The second beaker contains 200 mL of water and 50 fronds of duckweed. The third beaker contains 300 mL of water and 40 fronds of duckweed.
A pond contained 50 fish that have a mass of 800 grams each. What is the total mass of all the fish in the pond in kilograms?
