Tumbles occur when
a. the flagella rotate counterclockwise.
b. the flagella stop rotating.
c. the flagella undulate.
d. the flagella rotate clockwise.
Answer: d. the flagella rotate clockwise.
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With regard to tight junctions,
A) one face of the cell, the apical surface, is in contact with other cells. B) they allow free movement of ions and molecules between cells. C) they are responsible for holding cardiac muscle together. D) they are composed of special proteins called connexins. E) they block the movement of basolateral integral membrane proteins to the apical surface.
Which of the following statements is true about chemical elements in an ecosystem?
A scientist is studying endosymbiosis in cells. This means she is investigating
A. how mitochondria and chloroplasts were derived from eukaryotic cells. B. how mitochondria and chloroplasts were derived from prokaryotic cells. C. how mitochondria and chloroplasts evolved into eukaryotic cells. D. how mitochondria and chloroplasts evolved into prokaryotic cells.
Leaching is caused by
a. bacterial action. b. wind. c. water. d. microbial activity. e. none of these.