Which of the following statements about the role of fire in biomes / ecosystems is true?
A) Forest fires did not occur in the times before human settlement.
B) Fires decrease the number of animal communities in ecosystems by destroying habitat.
C) Forest fires are extremely destructive to ecosystems and should be put out as quickly as possible.
D) Fire is essential to maintaining some ecosystems.
E) Fire is not an important factor in developing and maintaining ecosystems.
Answer: D) Fire is essential to maintaining some ecosystems.
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A cell that lacks sulfite oxidase but can still oxidize sulfur for energy could be identified by
A) adenosine phosphosulfate reductase coupled with substrate-level phosphorylation. B) electrons being transferred to cytochrome c prior to shuttling them into the electron transport chain. C) identifying an alternative quinone, flavoprotein, or cytochrome. D) quantifying the release of sulfate byproduct.
In the context of ribosomes, the Svedberg value 60S most likely represents:
A. an intact bacterial ribosome. B. an intact eukaryotic ribosome. C. a large bacterial ribosomal subunit. D. a large eukaryotic ribosomal subunit. E. a small eukaryotic ribosomal subunit.
Prokaryotic transcription always proceeds from the same DNA strand for each gene. What do we call this strand?
a. pattern strand b. nonsense strand c. template strand d. holostrand
Why are there so many species of living things alive on earth now, more than at any time in earth's history?
What will be an ideal response?