The process by which plant parts are shed is ________
a. photoperiodism
b. senescence
c. dormancy
d. abscission
d
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Using the NeoR/Tk system of introducing gene replacements into mice (as described in the text), which of the following would identify those mouse cells that were the result of homologous recombination?
A. NeoR only B. Tk only C. NeoR and Tk D. Neither NeoR or Tk
Photosynthesis must provide a source of electrons and H+ because ____
a. atmospheric CO2 must be oxidized by adding electrons b. CO2 must be reduced to produce sugars c. hydrogen atoms are added to oxygen to form water d. hydrogen ions and electrons react to produce hydrogen gas e. hydrogen ions and electrons are converted into oxygen gas
The process of producing NH4
+ from decaying organic material is called
a. nitrification. b. ammonification. c. nitrogen cycling. d. nitrogen fixation. e. nitrogen assimilation.
Refer to Figure 10-1. Which of the following combinations of letters accurately represents two sister chromatids?
a. A and B
b. A and C
c. A and D
d. A and E
e. B and F