Describe the major taxonomic divisions of prokaryotic organisms.
What will be an ideal response?
Bergey's Manual of Systematic Bacteriology divides prokaryotes into two domains, the Archaea and the Bacteria, based on differences in their rRNA sequences, cell wall structures, cytoplasmic membrane proteins, and features of mRNA translation. The Archaea are divided into two major phyla (Crenarchaeota and Eukaryarchaeota) and three minor phyla. The Bacteria are divided into 24 phyla. Among these 24 phyla of Bacteria are the phylum Firmicutes (which includes low G + C Gram-positive bacteria) and the phylum Actinobacteria (which includes high G + C Gram-positive bacteria). The majority of Gram-negative bacteria are placed in the phylum Proteobacteria, which itself is divided into five classes: alpha, beta, gamma, delta, and epsilon. These groups include a variety of pathogenic as well as environmentally important genera. Other Gram-negative bacteria, such as chlamydia and spirochetes, are not genetically related; however, they are grouped together in Bergey's Manual of Systematic Bacteriology for the sake of convenience.
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Where would you expect to find an organism possessing a cell membrane composed of large proportions of cholesterol and a predominance of unsaturated fatty acids?
A) frozen wastelands B) temperate regions C) tropical regions D) equatorial regions E) upper levels of an aquatic environment
In __________ speciation, populations in contact along a common border speciate. Fill in the blank(s) with the appropriate word(s)
Which of the following is incorrect about complement?
A. It involves an alternate pathway. B. It involves a classical pathway. C. It is composed of at least 20 blood proteins. D. It only appears in the blood during a response to a pathogen. E. It acts in a cascade reaction.
Atmospheric pressure at sea level is equal to a column of 760 mm Hg. Oxygen makes up 21 percent of the atmosphere by volume. The partial pressure of oxygen ( ) in such conditions is _____
A) 160 mm Hg B) 16 mm Hg C) 21/760 D) 760/21