Branch points further down (within) the phylogenetic tree in the figure above represent:
a. an extinction.
b. a speciation event.
c. a domain.
d. the formation of a new family of organisms.
B
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Which repair mechanism requires light energy?
A. nucleotide excision repair (NER) B. base excision repair (BER) C. mismatch repair (MMR) D. photoreactivation E. transcription coupled repair
Territorial behavior provides a specific example of ____, the conveyance of information to other individuals
a. taxis b. kinesis c. habituation d. communication e. imprinting
Mycoplasma tuberculosis, the causative agent in tuberculosis, primarily infects the alveolar macrophages and is therefore very fortunate in its size. Why is this statement true?
A) It is just large enough to land in the mucociliary ladder, where type II macrophages phagocytize them. B) It is too small to be caught in the mucociliary ladder and too large to be immediately exhaled, thereby landing it in the alveoli. C) It is just small enough to land in the bronchi, where it is absorbed by alveolar macrophages. D) It is just large enough to land in the respiratory bronchiole, where it migrates to the alveoli. E) It is just small enough to land in the mucociliary ladder, where it is moved to the alveoli to infect macrophages.
The plants and animals now present on acreage from which the trees were removed ten years earlier
represent a. primary succession. b. a climax forest. c. pioneer species. d. secondary succession. e. species introductions.