Mammals belong to a synapsid clade called ______________.

A. placoderms
B. ostracoderms
C. cloacae
D. therapsids
E. placentals


Answer: D

Biology & Microbiology

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Toxic substances accumulate through natural trophic flow of an ecosystem.

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

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B cells are more effective than macrophages in presenting antigens to activate T cells when

A. antigen concentrations are low. B. macrophages are in short supply. C. antigen concentrations are high. D. None of the choices are correct.

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You have drained a pond on your property to make it deeper.  In the process of using a machine to dig, you find that the mud is black and smells terrible.  Your prediction is that ________ bacteria predominate in this area of the mud.

A. nitrogen-fixing B. nitrifying C. sulfur-reducing D. sulfur-oxidizing E. denitrifying

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Glycolysis

a) is not performed in plants, which get their energy solely through photosynthesis b) completely oxidizes glucose to carbon dioxide c) is performed solely on the glucose ingested by the organism d) is also referred to as the Krebs cycle e) occurs in all cells

Biology & Microbiology