Which form is considered diagnostic in the life cycle of Pneumocystis jirovecii?
a. Bradyzoite
b. Trophozoite
c. Sporocyte
d. Cyst
D
This organism exists as three forms in its life cycle: (1) trophozoite, (2) precyst (sporocyte), and (3) cyst. The cyst form is considered diagnostic.
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Using the great lubber grasshopper as a model, Walter Sutton observed:
A. separation of maternal and paternal chromosomes during mitosis. B. replication of chromosomes during meiosis. C. crossing over of homologous chromosomes. D. pairing of homologous chromosomes during mitosis. E. pairing of homologous chromosomes during meiosis.
Which of the following statements about predation are true? Check all that apply.
_____ Cycling of predator and prey populations is not commonly observed. _____ Removal of a predator often leads to increased community stability. _____ Animal predation on plants is called herbivory. _____ Predation can induce coevolutionary changes in prey species. _____ Batesian mimicry is not a coevolutionary adaptation to predation.
A fragile site
a. is found only on the X chromosome. b. occurs in only one of the sister chromatids. c. is associated with cancerous cells. d. is usually not inherited. e. is the result of genomic imprinting
Human skin color is an outcome of interactions among the products of about how many genes?
A. 5 B. 20 C. 75 D. 150 E. 350