Trees undergoing photosynthesis in a mature forest can best be described as
A) primary consumers.
B) secondary consumers.
C) chemoautotrophs.
D) primary producers.
E) heterotrophs.
D
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Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet. B. of the possibility of numerous medicinal uses. C. they are keystone species in many areas—their loss will cause other populations to crash. D. amphibians are very sensitive to environmental change—they may be indicating serious problems. E. they are increasing to the point of competing with indigenous species.
The time it takes for cells to divide
A. varies, but it takes sophisticated equipment to measure this small difference. B. depends on the health and environment of the cell. C. does not vary at all, but is controlled by an internal clock. D. varies widely and unpredictably in cells of the same local area of the same organism during any specific time period.
Which one of the following fungal groups has an alternation of multicellular gametophyte and sporophyte generations?
A. Ascomycetes B. Glomeromycetes C. Blastocladiomycota D. Chytridiomycetes E. Zygomycetes
In oxidation-reduction reactions, ____.
A. both molecules give up electrons B. both molecules gain electrons C. cells harvest energy D. the molecule that accepts electrons is reduced E. hydrogen ions are usually absorbed