A gamete having more than one complete set of paired chromosomes
A. is polyploid.
B. will undergo mitosis.
C. cannot be produced by meiosis.
D. is not yet through meiosis.
E. cannot participate in fertilization.
A. is polyploid.
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Use the following information to answer the question(s) below. Giardia intestinalis can cause disease in several different mammalian species, including humans
Giardia organisms (G. intestinalis) that infect humans are similar morphologically to those that infect other mammals; thus they have been considered a single species. However, G. intestinalis has been divided into different subgroups based on their host and a few other characteristics. In 1999, a DNA sequence comparison study tested the hypothesis that these subgroups actually constitute different species. The following phylogenetic tree was constructed from the sequence comparison of rRNA from several subgroups of G. intestinalis and a few other morphologically distinct species of Giardia. The researchers concluded that the subgroups of Giardia are sufficiently different from one another genetically that they could be considered different species. (T. Monis et al. 1999. Molecular systematics of the parasitic protozoan Giardia intestinalis. Mol. Biol. Evol. 16[9]:1135-44.) According to the phylogenetic tree in the figure above, G. intestinalis constitutes a _____ group. A) paraphyletic B) monophyletic C) polyphyletic
Cell mediated immunity is mostly the function of
A. cytotoxic T cells. B. B cells. C. helper T cells. D. complement cells. E. mast cells.
What is the term for a short section of an underground stem that is encased by overlapping layers of thickened, modified leaves (scales)?
a. corms b. tubers c. bulbs d. stolons e. rhizomes
Based upon the age structure diagram, you expect the Indian population to
A. shrink. B. stay constant. C. grow and then stabilize D. grow exponentially.