The drug used to treat sickle cell anemia that causes elevated levels of fetal hemoglobin is
____________. Fill in the blank(s) with the appropriate word(s).
ANS: hydroxyurea
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What drives the flow of water through the xylem?
A) passive transport by the endodermis B) the number of companion cells in the phloem C) the evaporation of water from the leaves D) active transport by sieve-tube elements E) active transport by tracheid and vessel elements
In a study examining the effects of disturbances and recruitment on the growth of coral in a portion of the Great
Barrier Reef, researchers concluded that changes in the coral colonies are ____.
a. due to external factors only. b. due to internal factors only. Chapter 53 - Population Interactions and Community Ecology Cengage Learning Testing, Powered by Cognero Page 16 c. due to both external and internal factors. d. solely due to human interference. e. not observable after disturbances
The autonomic subdivision of the vertebrate nervous system would innervate all but which organ?
a. intestinal muscles b. skeletal muscles c. heart d. pancreas e. liver
42. The most common type of skin cancer is __________. Fill in the blank(s) with the appropriate word(s)