One feature that phloem cells have that xylem cells lack is:
A. water potential
B. cell walls
C. plasmodesmata
D. membranes
E. cytosol
D. membranes
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Which of the following series is arranged in the correct sequence of occurrence during the fixation and subsequent use of nitrogen?
A. atmospheric nitrogen; bacterial nitrogenase; ammonia; conversion by plants or algae; synthesis of proteins B. atmospheric nitrogen; bacterial nitrogenase; conversion by plants or algae; ammonia; synthesis of proteins C. atmospheric nitrogen; ammonia; bacterial nitrogenase; conversion by plants or algae; synthesis of proteins D. atmospheric nitrogen; ammonia; bacterial nitrogenase; synthesis of proteins; conversion by plants or algae E. none of the other options displayed
The part of the brain that deals with the basic drives
such as hunger, sex, and thirst is the a. cerebrum. b. pons. c. cerebellum. d. thalamus. e. hypothalamus.
________ are the group of microorganisms composed only of hereditary material wrapped in a protein covering.
Fill in the blank(s) with the appropriate word(s).
This figure shows horizontal gene transfer and the early evolution of life. By this diagram, which of the fol-lowing is NOT true?
a. Bacteria have transferred genes to eukaryotes twice. b. Bacteria have transferred genes to archaea many times. c. Archaea have exchanged genes with eukaryotes. d. Bacteria have transferred genes among themselves. e. Eukaryotes have transferred genes among themselves.