Based on the tree shown above, a grouping composed of Species A, Species, B and Species D only is considered:
A. paraphyletic.
B. polyphyletic.
C. monophyletic.
D. sister groups.
E. None of the of the answer options is
correct.
A
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In the wake of the retreat of a glacier, leaving bare rock and sand, the action of the first colonizing species in this environment to make the area suitable for other species is called
A. secondary succession. B. climax succession. C. seral accumulation. D. facilitation. E. optimal succession.
The ________ is the collection of microorganisms (and their genes) that are normally present in and on an organism.
Fill in the blank(s) with the appropriate word(s).
The first active Drosophila segmentation genes are the ____, which begin organization of the body into regions
a. pair-rule genes b. segment polarity genes c. gap genes d. homeotic genes e. maternal effect genes
A researcher has used in vitro mutagenesis to mutate a cloned gene and then has reinserted the mutated gene into a cell. To have the mutated sequence disable the function of the gene, what must then occur?
A) recombination resulting in replacement of the wild type with the mutated gene B) use of a microarray to verify continued expression of the original gene C) replication of the cloned gene using a bacterial plasmid D) transcription of the cloned gene using a BAC