Which of the following does NOT facilitate biofilm formation?
a. accumulation of c-di-GMP in Pseudomonas aeruginosa
b. high cell density detected by quorum sensing in Pseudomonas aeruginosa
a. accumulation of c-di-GMP in Vibrio cholerae
b. high cell density detected by quorum sensing in Vibrio cholerae
Answer: B
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A positive test was observed on a serum sample that resulted in the formation of a fine precipi-tate on a reaction card. The most likely organism serologically identified is:
a. Chlamydia trachomatis. b. Bacillus anthracis. c. Treponema pallidum. d. Toxoplasma gondii.
Which of the following is a correct expression of the Hardy-Weinberg equation?
a. p + q = p2 + q2 b. p2 + 2pq + q2 = 0 c. p2 + pq ? q2 = 1 d. p2 + 2pq + q2 = 1 e. p+q = 0
Which have a collagen cuticle, a pseudocoelom, a tubular digestive system and no respiratory or circulatory organs?
a. roundworms b. cnidarians c. flatworms d. annelids e. porifera
All of the following pertain to poliomyelitis, except
A. it can be asymptomatic or mild with headache, sore throat, fever, and nausea. B. it is transmitted primarily by fecal contaminated water. C. there are effective vaccines to prevent polio. D. if virus enters the central nervous system motor, neurons can be infected and destroyed. E. summer outbreaks in the U.S. have been recently increasing.