DNA does not exist as a naked double helix in the nucleus of a cell, but is complexed with proteins to form a fine filamentous material called _________.
Fill in the blank(s) with the appropriate word(s).
chromatin
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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
Four of these factors play a role in phylogeny. Which one does not?
a. number of digits b. DNA sequence for a gene c. amino acid sequence of an enzyme d. number of petals e. number of individuals
Which of the following groups consists of large neurons?
A) Stellate, pyramidal, Golgi Type II B) Purkinje, granule, stellate C) Pyramidal, Purkinje, Golgi Type I D) Purkinje, pyramidal, granule
Chemolithotrophs generally derive ________ ATP from oxidation of inorganic substrates because the reduction potentials of those substrates are much more ________ than the reduction potential of organic substrates.
A. more; negative B. less; negative C. more; positive D. less; positive