Which type of nutrient can pass across epithelial cells without any expenditure of ATP?
A. iron
B. calcium
C. protein
D. fat
E. magnesium
D. fat
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During which period did the coal forests form?
a. Cambrian b. Carboniferous c. Quaternary d. Jurassic e. Ordovician
Which of the following conclusions is supported by the research of both Went and Charles and Francis Darwin on shoot responses to light?
A) When shoots are exposed to light, a chemical substance migrates toward the light. B) A chemical substance involved in shoot bending is produced in shoot tips. C) Once shoot tips have been cut, normal growth cannot be induced. D) Light stimulates the synthesis of a plant hormone that responds to light.
Covers ends of bones at joints, supports the nose and airway passages.
What will be an ideal response?
Normal blood pressure for an 8-year-old boy is 100/67 mm Hg. The systolic blood pressure is
(a) 33 mm Hg. (b) 100 mm Hg. (c) 67 mm Hg. (d) 167 mm Hg.