Archaea were given their own separate domain because they are ____
a. considered a type of bacteria
b. most closely related to eukaryotes
c. multicellular
d. nucleated
e. not prokaryotic
ANSWER: b
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Which is false regarding the two-component regulatory system in bacteria?
A. One part of the system is exposed to the external cellular environment while another part is exposed to the cytoplasm. B. The system involves a sensor kinase and a response regulator. C. The sensor kinase is phosphorylated by the response regulator when the extracellular environment changes. D. Regulation of OmpF and OmpC porin proteins in E. coli is modulated by this type of system.
Scientists perform ____ in order to ____ a
given ____.
a. experiments; test; hypothesis. b. tests; experiment; law. c. tests; experiment; variable. d. facts; test; variable. e. hypotheses; try; experiment.
Members of phylum Arthropoda have paired, jointed appendages
____________________ Indicate whether the statement is true or false.
Which of the following particles are retained by clay soil and exchanged for hydrogen ions when plants take them up?
A. calcium & potassium B. calcium & copper C. iron & boron D. calcium & ammonium E. sodium & sulphur