Communities with a high level of bacterial diversity are found in many habitats including soil and aquatic environments. Recent studies indicate this diversity is crucial to the functioning of these communities. The same studies have also found that phage abundance plays a critical role in the maintenance of the bacterial diversity within these communities. Are phages a density-dependent or a density-independent regulating factor?

A. Density-dependent
B. Density-independent


Answer: A

Biology & Microbiology

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Trees of life that illustrate the phylogenetic relationships of all organisms were traditionally based on ________; newer methods for determining phylogeny rely on ________.

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While on an archaeology expedition, you unearth a skeleton with the following characteristics: four long, slender finger bones and a smaller opposable thumb bone, long arm bones, fingernails, and eye sockets close together on a skull

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What occurs in the structure labeled A in the accompanying figure?

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Biology & Microbiology