Which of the following characteristics can distinguish vaginitis and vaginosis?
A. Causative agent
B. Presence of discharge
C. Presence of vaginal inflammation
D. All of the choices are correct.
Answer: D
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The specimen of choice for detecting tuberculous pulmonary mycobacterial disease is:
a. spontaneously produced sputum. b. gastric lavage. c. transtracheal aspiration. d. bronchoscopy.
Which of the following is an advantage of water as a respiratory medium?
a. Water holds less O2 than air. b. In water, O2 concentration can be affected by solute concentration. c. The density of water makes it more difficult to ventilate over the respiratory surface. d. In water, O2 concentration can be affected by temperature. e. Water keeps the respiratory surface wetted.
A dihybrid cross of two contrasting pure-breeding
organisms a. produces homozygous offspring. b. must produce a phenotype different from either pure-breeding parent. c. results in the disappearance of the recessive traits in the first generation. d. takes place only in the laboratory under precisely controlled conditions. e. will result in the immediate formation of another pure-breeding variety.
Every protein has a unique shape and function because:
A) each protein has a unique sequence of amino acids. B) the bonds between the amino acids vary from protein to protein. C) the number of nitrogen atoms in each amino acid differs. D) each protein has a unique sequence of nucleotides.