BA 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?

SP 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?

In eukaryotes, during DNA replication, what are the roles of the DNA polymerases alpha (α), delta (δ), and epsilon (ε)?  

BA 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?

BA Which of the following best describes the mode of transmission of both the bacterium the causes Lyme disease (Borrelia burgdorferi) and the bacterium that cases plague (Yersinia pestis)?

In prokaryotes, which DNA polymerase is responsible for removing the RNA primers and replacing them with DNA?

The DNA sequence that is complementary to 5′ AATTCGCTTA 3′ is

Which of the following is true about bases and base pairing in DNA?

Which of the following would be most likely to cause a frameshift mutation?

What is an important difference between prokaryotic and eukaryotic DNA that makes eukaryotic DNA replication and gene expression much more complex?