Which of the following soils holds the most water?
A) clay loam on a ridgetop
B) sandy loam in a valley
C) clay loam in a valley
D) sandy loam on a ridgetop
C
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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?
In opsonization with IgG, why would it be important that IgG react with the antigen BEFORE a phagocytic cell recognizes the antibody molecule?
A. If the IgG is bound to the phagocyte BEFORE opsonization, it would most likely be ingested by the phagocyte before it could bind to a pathogen (it would be "naked," so to speak). B. Binding of IgG by phagocytes would block the antigen binding sites on the IgG molecules, preventing them from binding to the microbes. C. Binding of IgG by phagocytes changes their conformation-and by changing their protein conformation, their antigen binding sites are changed and they can no longer recognize their specific antigenic epitopes. D. Binding of antibody by phagocytes results in immediate release of protein-destroying enzymes to the outside of the cell. Since antibodies are proteins, they would be destroyed by these enzymes (and would then be unable to bind to their specific antigenic epitopes).
What happens in an electron transport chain?
a. Electrons move from a low energy level to a higher energy level. b. Electron movement transfers energy to enzymes and other molecules. c. Electron movement generates energy during each step. d. Energy from the electrons is stored for future use in pigments. e. The energy from the electron movement is used to break down ATP.
Environmental factors which can mediate resistance include
A) pH B) Cation concentration C) Atmospheric conditions D) Thymidine concentration E) All of the above