A 24-year-old African-American man comes to the emergency room 3 hr after the onset of severe back and chest pain. These problems started while he was skiing. He lives in Los Angeles and had a previous episode of these symptoms 5 years ago while visiting Wyoming. He is in obvious pain. Laboratory studies show the following:

Hemoglobin                                        11 gm/dl

Leukocyte count                                 22,000/μl3

Reticulocyte count                              25%

What is the diagnosis of this patient?

TLS Online TPP Program

#Question id: 9208

#Unit 9. Diversity of Life Forms

Which of the following threats to biodiversity is targeted at specific species rather than groups of species?

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#Question id: 11126

#Unit 7. System Physiology – Animal

Which of the following is characteristic of the events occurring at an excitatory synapse?

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#Question id: 3864

#Unit 3. Fundamental Processes

RNA polymerase:

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#Question id: 3024

#Unit 2. Cellular Organization

In a rapidly multiplying bacterial population, cell numbers increase

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#Question id: 620

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about a plot of V0 vs. [S] for an enzyme that follows Michaelis-Menten kinetics is false?