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Dogs are extremely susceptible to poisoning by theobromine from chocolate, but only extreme doses complicate humans. Below are the oral LD50s:
LD50 half life
Dog 300 mg/kg 17 hr
Human 1200 mg/kg 2 hr
Given the data, provide a plausible explanation of why the half-life and LD50 are so different for this toxicant (limit 3-4 sentences)
Explain your thoughts aout the following statement: Humans rely on other organisms for survival; however, other organisms do not need humans for survival.
What type of bond is formed by an atom with four electrons in its outermost shell?
What is a factor that would limit the settlement of new settlers on top of existing marine organisms?
Transcription factor X binds to a response element in gene A and gene B. In muscle cells, transcription factor X activates transcription of gene A. In neuronal cells,
Calculate the osmotic pressure, at 30°C, of 58.5 grams of NaCl in 1 liter of solution against pure water with a membrane that separates the pure water and salt solution and is impermeable to NaCl but permeable to water.
What is a hierarchy? Are complex things built from simple parts? Give examples from everyday life.
A cell population that you are increasing in a culture dish expresses Sox2. Discuss how do you make sure it is a pluripotent cell, not a neural stem cell?
What advantage will heterozygotes have over the homozygotes. Why selection inevitably favors any gene that is good at getting into the next generation, regardless of whether that gene helps or hurts the ecosystem, the species, the group, or even the ..
In a population of desert bighorn sheep, a mutant recessive allele c has been discovered to cause curled coats in both males and females. The normal dominant allele C produces straight coats.
How is research important in preventing disease and/or the spread of disease? Give an example of how research has helped improve the outcomes of people with certain diseases. Also, explain how scientists determine if research sources and/or da..
Drosophilafemales homozygous for the third chromosomal genes pink-eye and ebony body were crossed with males homozygous for 2nd chromosomal gene apterous wings.
Which statement is false regarding cytotoxic T cells?
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