The most predominant anaerobe isolated in animal bites is:
a. Veillonella spp.
b. Clostridium spp.
c. Prevotella spp.
d. Fusobacterium spp.
D
The most common animal bites are from domestic cats and dogs. Bites from these animals (Fig-ure 75-6) are usually infected with organisms commonly found in the animal's oral and nasal fluids. The most frequently isolated aerobes are Pasteurella, Streptococcus, and Staphylococcus species. The most frequently isolated anaerobes are Fusobacterium, Bacteroides, and Porphy-romonas species. Similar to human bites, animal bite wound infections are usually polymicrobial and include aerobes and anaerobes.
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A bacteria contains two copies of the lac operon; one on the bacterial chromosome and one on a plasmid. The lacO site on the chromosomal lac operon is mutated and non-functional whereas the lacO site on the plasmid is functional. What is the most likely outcome for the bacterial cell when glucose is declining and lactose is present?
A. Expression of lac structural genes on the chromosome and plasmid will decrease because two copies of the lacO site are needed for repression of the lac operon. B. Expression of lac structural genes on the chromosome and the plasmid will increase because more repression of the lac operon occurs as glucose decreases. C. Expression of lac structural genes on the chromosome and plasmid will increase because the lacO site does not affect the CAP protein that activates the operon. D. Expression of lac structural genes will not change because the lacO site is not involved in repression of the lac operon.
Which of the following is the cancer of epithelial cells?
A. sarcoma B. lymphoma C. leukemia D. carcinoma E. myoloma
Oxytocin is secreted by the posterior pituitary only in females
Indicate whether the statement is true or false.
What are the major effects of deforestation?
What will be an ideal response?