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
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What is one way in which plant development differs from animal development?
A. Plants can develop only from somatic cells B. Plants lack morphogens C. Cell migration occurs in plants
Trees of life that illustrate the phylogenetic relationships of all organisms were traditionally based on ________; newer methods for determining phylogeny rely on ________.
A. morphology; nutritional requirements B. nucleic acid sequences; microbiomes C. nucleic acid sequences; morphology D. morphology; nucleic acid sequences E. morphology; virology
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
What type of organism do you suspect you may have found? A) an anthropoid B) a tarsier C) a crustacean D) a marsupial
What occurs in the structure labeled A in the accompanying figure?
A. Attachment B. Locomotion C. Protein-making D. Breathing E. Communication