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

Biology & Microbiology

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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.

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An artery is indicated by

a. A. b. B. c. C. d. D. e. E.

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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.

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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

Biology & Microbiology