A newborn boy does not pass meconium in the first 24 hours. His abdomen is distended, and he begins vomiting. Various other tests lead to a diagnosis of Hirschsprung's disease. An obstruction is most likely to be found in which portion of the gut? A. Ascending colon
B. Ileocecal sphincter
C. Lower esophageal sphincter
D. Pylorus
E. Sigmoid colon

You are given an electron micrograph of a bacterial cell. in the micrograph you can clearly see three thin layers of different densities surrounding the cell. based on the micrograph, you can infer that this cell is and would appear after application of the gram stain procedure. gram-negative / pink gram-positive / purple gram-positive / pink gram-negative / purple