Describe the chemical properties of phospholipids that account for their behavior in water
What will be an ideal response?
Phospholipids have polar phosphate "heads" and nonpolar fatty acid "tails," which interact in different ways with water molecules. The phospholipid heads are attracted to polar water molecules, but the nonpolar tails of the phospholipid are repelled by water. As the tails are driven away from the water molecules, they congregate together, either in the interior of a ball of lipid (called a micelle) or within the interior of a double layer of phospholipids (called a bilayer). This leaves the phosphate heads "outside," where they can easily interact with the water molecules.
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b. a very important and challenging part of a marine organism's survival. c. all of these choices. d. the movement of water across a membrane due to solute concentrations.
Stimulation of flowering in spring by prolonged exposure to low temperature in winter is called:
a. senescence b. vernalization c. abscission d. dormancy e. chlorosis
Inhalation
a. causes the diaphragm to contract and move downwards. b. is an active process. c. causes the rib cage to move upward. d. causes the thoracic cavity to expand. e. does all of these
In all of the following characteristics, prokaryotes differ from eukaryotes except in
A. multicellularity. B. organelles. C. cell size. D. chromosomes. E. nucleic acids as the hereditary material.