Select the most complete explanation of what the pH scale measures.
A. The acidity of a solvent
B. The alkalinity of a solvent
C. The concentration of buffers in a solution
D. The concentration of hydrogen ions in a solution
Answer: D
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The response to touch by such plants as the sensitive plant is due to:
A. changes in water content of cells B. changes in electrical impulses at the touched area C. auxin displacement in the touched area D. effect of gibberellins on the area affected E. sensitive responder cells
While on a field trip near the ocean coastline, you visit a company that harvests jellylike substance from protists. This substance can be used as food, or in biology lab dishes for culturing organisms that have red-blue pigments, and store starch like plants. The company extracts the substance from multicellular plant-like organisms. You are observing the economic values of
A. algin. B. gelatin. C. carrageenan. D. red ooze. E. agar.
Which of the following statements concerning HIV infection is false?
1.HIV infects cells in the immune system. 2.HIV uses reverse transcriptase to copy its genome. 3.HIV becomes a provirus. 4.HIV never produces viral particles. 5.HIV can infect other cells in the immune system for years.
All vertebrate forelimbs are the same in that they are used for the same form of locomotion.
Answer the following statement true (T) or false (F)