In the soil, some ________ help to decompose dead organisms and other waste materials, returning vital chemical elements such as nitrogen to the environment
A) slime molds
B) animals
C) protozoans
D) prokaryotes
D
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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
The replisome has two main subcomponents. They are
A. the replication folk and the sliding clamp subunit. B. the primosome and the sliding clamp subunit. C. the replication folk and the DNA pol III enzymes. D. the DNA pol III enzymes and the sliding clamp subunits. E. the primosome and the DNA pol III enzymes.
Females of various species shop around for males that _____
a. are nomadic b. are highly selective c. are silent and strong d. make showy displays e. have a large family
nutrient
What will be an ideal response?