Describe how the amphipathic nature of phospholipids leads to the formation of the phospholipid bilayer organization observed in membrane structure. Based upon this information, how would you design a drug delivery system to cross the cell membrane?
What will be an ideal response?
Answer: Basically, student answers should include the orientation of phospholipids such that the phosphate ends are surrounded by a hydrating sphere and the hydrophobic tails are sequestered within each other (giving the bilayer organization). The drugs could be placed inside phospholipid micelles that would be able to deliver the drugs by fusing with the cell membrane and releasing their contents into the cytoplasm.
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In which phase does the centromere break?
What will be an ideal response?
Metastatic tumors:a
are examples of neoplasms. b. contain cells tightly controlled by the cell cycle. c. contain nondividing cells. d. are caused by the normal expression of homeotic genes. e. are localized in one part of the body.
heterotrophs (animals, humans)
What will be an ideal response?
According to the original central dogma, what macromolecule or phenomenon is directly responsible for an organism's phenotype?
A. DNA B. mutation C. transcription D. RNA E. protein