Although toxic to early autotrophs and heterotrophs, ________ is essential to most modern forms of life, where it functions as an electron acceptor
a. oxygen
b. phosphate
c. magnesium
d. carbon dioxide
a
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The foul-smelling putrescine byproduct suggests activity of
A) amino acid fermentation by clostridia. B) secondary fermentation. C) sulfur-oxidizing bacteria. D) syntrophic carbohydrate metabolism.
An artery is indicated by
a. A. b. B. c. C. d. D. e. E.
From the point of view of an angiosperm, what is the function of fruit?
A) It is where the male gametophyte develops. B) It is a mechanism for the dispersal of seeds. C) It provides nutrients to germinating seeds. D) It attracts pollinators.
What two processes results in genetically-different products?
a)mitosis and meiosis b)mitosis and asexual reproduction c)meiosis and asexual reproduction d)meiosis and sexual reproduction e)mitosis and sexual reproduction