Biology, 19.11.2020 20:10 stphdrn4347
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A brand new zygote divides by mitosis and cytokinesis over and over. Before the cells are specialized, they are called stem cells. How do stem cells specialize into a nerve and red blood cell?
1. The nerve and red blood cells will have different DNA and thus make different proteins. 2. They nerve and red blood cells are going to have the same DNA and will use the same genes to make the same exact proteins.
3. The nerve and red blood cells will turn on and off different portions of their DNA, using different genes to make different proteins.
4. The nerve and red blood cells will have the exact same structure and function.
Answers: 3
Biology, 21.06.2019 18:30
The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.
Answers: 3
Biology, 21.06.2019 21:30
List the advantages and disadavantages of the switch from persistent chlorinated hydrocarbon pesticides (such as ddt) to nonpersistent organophosphate pesicides. have the benefits of the switch outweighed the disadvantages? explain.
Answers: 3
Biology, 21.06.2019 23:10
Drag the correct tiles to the image. not all tiles will be used. the diagram is a schematic representation of the electron transport mechanism in mitochondria. label the diagram to complete the model.
Answers: 3
Biology, 22.06.2019 02:30
Variety of living organisms; includes genetic, species, and ecological types.
Answers: 1
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A brand new zygote divides by mitosis and cytokinesis over and...
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