Stan, a champion athlete, sleeps up in the mountains at 10,000 feet every night to increase his red blood cell count for better athletic performance. Which hormone increases to make that possible?
A) hemoglobin
B) erythropoietin
C) Rh factor
D) fibrin
B
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One of the most important types of information that a patient can bring to an initial appointment with a genetic counselor is
A) her immunization records from childhood. B) results of a comprehensive lipid profile. C) the family health history, extending to second degree relatives. D) a list of the occupations of every family member.
Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?
A) 10-10 M B) 10-4 M C) 10-7 M D) 10.0 M
Which statement best describes how flight and feathers are related in the evolution of birds?
A) The first flying birds did not have feathers, which evolved later. B) Feathers and flight evolved at the same time. C) The first feathered ancestors to birds did not fly but may have used their feathers for insulation and display. D) Feathers are soft and do not leave fossils or fossil traces, so it is unknown which organisms first had feathers.
Which one of the following terms best applies to the fungus participant in a typical lichen?
A. Ectomycorrhizal fungus B. Mutualist C. Arbuscular mycorrhizal fungus D. Epiparasite