Plastids originated from which of the following groups of prokaryotes?

A. Cyanobacteria
B. Spirochaetes
C. Proteobacteria
D. Archaea
E. Actinobacteria


A. Cyanobacteria

Biology & Microbiology

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Aquatic organisms are unable to tolerate low pH conditions mainly because acidic waters contain high concentrations of toxic

A) sodium. B) chlorine. C) aluminum. D) carbon dioxide.

Biology & Microbiology

Pyramids of numbers are of limited usefulness because they:a

do not indicate the biomass of the organisms at a given time. b. do not indicate the gross primary productivity of each species. c. do not include energy flow through the ecosystem. d. include three trophic levels. e. None of the answer choices is correct.

Biology & Microbiology

Of the following levels of organization, Archaea have

A) molecules only. B) atoms only. C) atoms and molecules. D) atoms, molecules, and organs. E) organs only.

Biology & Microbiology

The intensity of a message is determined by how many action potentials are generated within a given time.

Answer the following statement true (T) or false (F)

Biology & Microbiology