Enhanced immune responses to subsequent exposures to an antigen to which the body has already been exposed are known as ________ responses
A) third-degree immune
B) allergic
C) primary immune
D) memory
E) autoimmune
D
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What is the function of the cell wall?
A. To provide the stiffness needed B. To help maintain the shape of the cell C. To provide protection for the cell D. All of the above are functions of the cell wall
If you were studying the ecology of a marsh community, what components would you need to consider?
What will be an ideal response?
The "Central Dogma" of molecular biology described by Watson and Crick describes
A. the passing of genetic information from DNA to RNA by translation. B. the passing of genetic information from RNA to protein by transcription. C. the inheritance of traits between generations. D. the production of energy in a cell. E. the directional flow of genetic information in cells.
If human white blood cells were extracted from the circulatory system and then placed into an isotonic solution, which one of the following is most likely to occur?
A) Water will rush into the cells, and the cells will swell and eventually burst. B) Because there is more water outside the cell than inside the cell, an equal amount of water will enter the cell and leave the cell. C) There will be no change in the cells because the isotonic environment is in equilibrium with the cells. D) Because a hypertonic environment is highly acidic, these cells will become acidic as well. E) Water will diffuse out of the cells, and they will decrease in cell volume.