Oxyhemoglobin contains _____
a. oxygen bound irreversibly to a heme group
b. carbon dioxide
c. carbonic anhydrase
d. bound oxygen in the absence of a heme group
e. oxygen bound reversibly to a heme group
ANSWER: e
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a. sufficiently large numbers of a bacterium that can be observable with the unaided eye. b. derived from many different types of bac-terial cells. c. belonging to different genera and species. d. having different genetic and phenotypic characteristics.
Which of the following frequently causes health-care-associated infections of the GI tract?
A. Salmonella enteritidis B. E. coli C. Staphylococcus aureus D. Clostridium difficile
Which of the following best describes basal angiosperms?
a. a group of seed plants that exhibit traits of monocots and dicots b. a group of seedless plants that produce large fronds and cones c. a group of plants in which a network of cells transport water d. a group of plants that lack vascular tissue for transporting nutrients
Vitamin D is really a hormone.
a. true b. false