A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule.
B. polar bonds with the polar end of the phospholipid molecule.
C. hydrogen bonds with the nonpolar end of the phospholipid molecule.
D. hydrogen bonds with the polar end of the phospholipid molecule.
E. covalent bonds with the nonpolar end of the phospholipid molecule.
D
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Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open. B. while the proteins are being assembled. C. after the cell is dead. D. while the DNA is being copied into RNA. E. during cell division.
The maximum useful magnification for a light microscope is about
a. 100X. b. 1000X. c. 10,000X. d. 100,000X.
Fick's law states that:a
the amount of gas diffusing across a membrane depends on differences in partial pressure. b. the total pressure of a mixture of gases is the sum of the pressures of the individual gases. c. the dissociation of oxygen from hemoglobin depends on the pH of the environment. d. as oxygen concentration increases, there is an increase in the amount of hemoglobin produced. e. the size of an animal varies inversely to the amount of diffusion across its respiratory membranes
Plate tectonics explain that the amount of Earth being formed is much greater than the amount of the Earth's crust being destroyed in subduction zones.
Answer the following statement true (T) or false (F)