While examining a blood sample for the presence of Trypanosoma cruzi, you are able to distinguish an anterior flagellum but, because of the poor resolution of the microscope you are using, cannot tell if an undulating membrane is present or not. Which stages of the hemoflagellate may be present?
> Amastigote
> Promastigote
> Epimastigote
> Trypomastigote
> Promastigote
> Epimastigote
> Trypomastigote
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Which would be most likely to be fossilized?
A. a common large worm. B. a common thick-shelled crustacean. C. an herbaceous plant that is only found at very high altitudes. D. a rare, desert-dwelling lizard.
What insight did Nettie Stevens's studies of the beetle Tenebrio molitor provide about the chromosome theory of inheritance?
A) Genes are located on chromosomes. B) The number of autosomal chromosomes varied between gametes. C) Crossing over occurs between homologous chromosomes. D) Sex is determined by the presence of an X or Y chromosome in the male gamete. E) Chromosomes assort independently into the haploid gametes.
The earliest pollinators of flowers were probably ____ that visited flowers to chew on the petals and leaves
a. mice b. bees c. earwigs d. beetles e. grasshoppers
Taxonomy is based on putting organisms into monophyletic groups. Which kingdom contains organisms that should be split into several kingdoms?
a. protista b. plantae c. fungi d. animalia