Which portion of this nucleotide is found at the 5’ end of a DNA or RNA strand? [Text describing the image: #1 shows a phosphate group attached to a carbon of ribose; #2 shows a base attached to a carbon of ribose; #3 shows an OH group attached to a carbon of ribose]
Read DetailsBA A 2 year old boy with a persistent cough is diagnosed with cystic fibrosis. A sputum specimen of green mucus was obtained and sent for Gram stain and culture. A Gram-negative rod was isolated that was subsequently identified as Pseudomonas aeruginosa. Which of the following properties is associated with this organism that will ultimately pose the greatest threat to the long-term survival of this patient?
Read DetailsSP A 4-year-old girl is rushed to the hospital with fever and a “barking” cough. She has had no childhood vaccines. Examination of her pharynx shows a “cherry-red” swollen epiglottis protruding into her airway. The etiolgoic agent is a coccobacillus. Which of the following bacteria is the most likely cause of this presentation?
Read DetailsBA A 15 year old boy goes to the physician after stepping on a rusty nail. The physician is concerned that he may develop a tetanus infection and in addition to giving the boy antiserum, he gives him an injection of tetanus toxoid (inactivated tetanus toxin). Which of the following is accurate in terms of describing mechanism of action for this toxin?
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