Before the evolution of photosynthesis, early cells extracted energy from ____
a. oxygen
b. ATP
c. NADPH
d. water
e. methane
ANSWER: e
Biology & Microbiology
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The soils in which most plants do best are ____
a. mixtures of mainly sand and silt b. sandy soils c. soils made mostly of humus d. clay soils e. loams
Biology & Microbiology
Mixed venous blood samples can be taken from which of the following blood vessels?
A) pulmonary vein B) inferior vena cava C) pulmonary artery D) aorta E) superior vena cava
Biology & Microbiology
Infections of Bacillus anthracis are initiated by
a) endospores. b) endotoxins. c) exotoxins. d) capsules.
Biology & Microbiology
A bacterial cell must have ________ in order to transfer portions of its chromosome to another cell.
A. growth enhancement genes B. an F factor C. a high frequency of combination plasmid D. a recombination factor E. All of the answers are correct.
Biology & Microbiology