Which of the following is not true of phospholipids?
A) Phospholipids are important in membrane structure.
B) Serine is a molecule that may be part of a phosphoglyceride.
C) Phosphatidic acid contains two fatty acids and a phosphate group.
D) Sphingolipids are the predominant phospholipid in membranes.
E) Phospholipids are amphipathic.
D) Sphingolipids are the predominant phospholipid in membranes.
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Parathion is effective and highly toxic to only about 5% of the human population
a. True b. False Indicate whether the statement is true or false
Even in the absence of transpiration, some water can move into the roots and partially up the xylem columns. This phenomenon is due to
A. flooding. B. stomatal opening. C. root pressure. D. proton pumps. E. phloem translocation.
The nervous system is capable of modifying its structure and function in a process known as:
a. hard-wiring. b. neural plasticity. c. reflex action. d. tolerance. e. ganglia.
What dense storage granules in plant cells are thought to contribute to gravitropism?
A) starch B) glucose C) proteins D) chlorophyll