While water continually orients phospholipids into a lipid bilayer, it does not fix the lipids permanently into position. Thus, the bilayer is considered to be ________.
A. static
B. charged
C. fluid
D. fluctuating
Answer: C
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Which of the following are NOT found in the gastrointestinal tract of healthy humans?
A) Bacteroides B) Clostridium C) Escherichia coli D) protists
Which of the following statements correctly describes the vascular cambium?
A. It develops between the primary xylem and the primary phloem in dicots. B. It occurs only in monocot stems. C. It is important in the elongation of roots. D. It is formed by the ground meristem. E. It is responsible for all cell types that result from primary growth.
The oldest "manufactured" tools have been found in:
a. North America b. Eurasia c. Africa d. Australia e. South America
Paired homologous chromosomes are found at
the spindle equator during a. metaphase I. b. telophase I. c. prophase II. d. metaphase II. e. anaphase II.