The presence of which of the following in a phylogenetic tree might indicate a lack of adequate data?
a. Polytomies
b. A basal taxon
c. Branch point
d. Homoplasies
e. Clades
Answer: a. Polytomies
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During the shotgun approach to genome sequencing, the sequenced fragments orginate from:
A. the beginning of a gene. B. the center of a gene. C. random sites scattered across the genome. D. targeted sites scattered across the genome. E. None of the answer options are correct.
Which of the following combinations is/are required for the secretion of testosterone?
a. GnRH only b. LH only c. Sertoli cells only d. GnRH and LH only e. GnRH, LH, and Sertoli cells
Which of the following is a common cause of
interrupted breathing? a. sleep apnea b. lung cancer c. high altitude sickness d. low red blood cell count e. none of these
Viruses can be classified based on their:
a. Physical and chemical properties b. Method of entry c. Method of release d. Color e. None of the answers are correct