A scientist traveling on a boat from Alaska to Antarctica took daily measurements of atmospheric pressure. At which latitudes were the lowest pressures found?
A) polar (~90°) and subpolar (~60°) latitudes
B) subpolar (~60°) and subtropical (~30°) latitudes
C) subpolar (~60°) and tropical (~0°) latitudes
D) subtropical (~30°) and tropical (~0°) latitudes
C
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When a potassium ion (K+) moves from the soil into the vacuole of a cell on the surface of a root, it must pass through several cellular structures. Which of the following correctly describes the order in which these structures will be encountered by the
ion? A) plasma membrane ? primary cell wall ? cytoplasm ? vacuole B) secondary cell wall ? plasma membrane ? primary cell wall ? cytoplasm ? vacuole C) primary cell wall ? plasma membrane ? cytoplasm ? vacuole D) primary cell wall ? plasma membrane ? lysosome ? cytoplasm ? vacuole E) primary cell wall ? plasma membrane ? cytoplasm ? secondary cell wall ? vacuole
Which proteins in the plasma membrane identify a cell as part of the same individual or as foreign?
a. transport proteins b. recognition proteins c. receptor proteins d. cell adhesion proteins e. nuclear proteins
Vinblastine, a drug that inhibits microtubule polymerization, is used to treat some forms of cancer. Cancer cells given vinblastine would be unable to _____
A) form cleavage furrows during cell division B) migrate by amoeboid movement C) separate chromosomes during cell division D) maintain the shape of the nucleus
Biologists consider the green algae to be the ancestors of plants because
What will be an ideal response?A. green algae have the same kind of chlorophyll as plants. B. many green algae form colonies with specialized cells. C. green algae and plants both have cellulose cell walls. D. All of the above are true.