You wish to study the impact of synthetic estrogen like hormones on the health of whales (and people). Select the organism from
the table below that would be best to use in your research. Why did you select this organism? Model Organism Characteristics
Yeast------------------Single celled, eukaryotic (contains a nucleus) Fruit fly---------------Multicellular, eukaryotic, invertebrate, arthropod Zebrafish-------------Multicellular, eukaryotic, vertebrate, fish Mouse-----------------Multicellular, eukaryotic, vertebrate, mammal
Fruit flies, because they are multicellular like whales Mouse, because they are mammals like whales Yeast, because they are eukaryotic like whales Zebrafish, because they live in the water like whales
Because humans are multicellular, eukaryotic (contains a nucleus), vertebrates, and mammals, the best organism to test the synthetic hormones on would be a mouse.
Explanation:
Humans and whales are multicellular (they have many cells) and their cells are eukaryotic (contain a nucleus). They also have a backbone (spinal column), which makes them a vertebrate. Finally, all humans and whales are mammals. Therefore, to get the best results, the testing should be performed on a mouse.
Performing the experiment on yeast would give good results for singular-celled organisms, like <em>protozoa</em>.
Performing the experiment on a fruit fly would give good results for multicellular invertebrates, like <em>spiders</em>.
Performing the experiment on zebrafish would give good results for all fish in general.
dyes used in negative staining have an. acidic chromagen (negatively charged chromophore) Examples of negative stains. NIgrosin and eosin. heat fixing smears can.