An enzyme synthesized in the laboratory is found to have lit…

An enzyme synthesized in the laboratory is found to have little activity when compared to the enzyme extracted from cell culture. Both enzymes were examined and have identical amino acid composition. Which of the following is the most likely explanation for the lack of activity of the synthesized enzyme?

6. A 7-year-old girl was at summer camp and dove into the la…

6. A 7-year-old girl was at summer camp and dove into the lake many times. She complained that water went up her nose a few times.  Several days later she is unresponsive and comatose. She was rushed to the hospital. A CSF fluid specimen was collected and several motile amoeba were observed. She is most likely suffering from an infection with the following parasite?

12.  A 4-year-old boy attended day care 3 days per week. He…

12.  A 4-year-old boy attended day care 3 days per week. He was irritable, and his parents noticed that he had persistent perianal itching. A sticky paddle was pressed against the perianal region and sent to the laboratory for testing. The eggs microscopically observed would most likely have which one of the following morphologic features?