The notochord
A) becomes the brain.
B) is for muscle attachment.
C) becomes the digestive system.
D) develops from the pharyngeal gill slits.
E) forms the nerve cord in an adult.
B
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Which type of nutrient can pass across epithelial cells without any expenditure of ATP?
A. iron B. calcium C. protein D. fat E. magnesium
Evaporation exerts tension on the narrow columns of water that fill xylem tubes. The tension occurs because liquid water has ____
a. cohesion due to hydrogen bonds b. cohesion due to ionic bonds c. translocation of sugars d. pressure due to compression within xylem e. high oxygen content due to soil conditions
Refer to Figure 40-5. The molecules required to bind at the sites labeled 1 and 2 for a cross bridge to
form are:a. Ca2+ and myosin. b. ADP and myosin. c. myosin and troponin. d. ATP and Ca2+. e. tropomyosin and O2.
The process of fossilization typically begins when an organism or traces of it ____.
A. settle on the seafloor B. are pressurized under the weight of sediment C. crystallize into minerals D. are saturated with groundwater E. become covered with sediments, mud, or ash