Which of the following is not true of the preliminary findings by the HMP thus far?
A. microbial antagonism prevents potential pathogens in the resident biota from causing disease
B. the number of bacterial genes outnumber human genes by millions in the holobiont
C. viruses have played an important role in guiding the evolution of both humans and their resident flora
D. there are many more sterile sites in the human than were previously assumed
Answer: D
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Although no definitive guidelines are available for the treatment of Sphingomonas paucimobilis infections, which antibiotic appears to have potential activity against this organism?
a. Penicillin b. Ttrimethoprim-sulfamethoxazole combi-nation c. Amoxicillin and Flagyl d. Isoniazid and Imipenem
Four of the five answers listed below are cofactors or coenzymes. Select the exception
a. mineral b. water soluble vitamin c. metallic ions d. NAD+ e. protein
Multiple origins of replication on the DNA molecules of eukaryotic cells serve to
A) remove errors in DNA replication. B) create multiple copies of the DNA molecule at the same time. C) shorten the time necessary for DNA replication. D) assure the correct orientation of the two strands in the newly growing double helix.
In order for allopatric speciation to occur, first there must be a geographic separation of two populations of the same species. The second step requires:
A) an increase in gene flow between the populations. B) additional extrinsic isolating mechanisms to become involved. C) physical and behavioral changes that keep them from interbreeding. D) physical and behavioral changes that permit occasional hybridization.