The umbilical cord of a mammal connects the
A) amnion and the chorion.
B) maternal and fetal bloodstreams.
C) yolk sac and the allantois.
D) fetus and the placenta.
E) embryo and the amnion.
D
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Ambiguously worded answer choices _____.
Fill in the blank(s) with the appropriate word(s).
The spores of streptomycetes are
A. motile by means of pseudopodia. B. motile by means of cilia. C. nonmotile. D. motile by means of flagella.
Purple sulfur bacteria and filamentous sulfur-oxidizers both
A. accumulate sulfur as intracellular granules. B. fix nitrogen. C. produce oxygen from carbon dioxide. D. use gliding motility.
Which of the following statements about monocots is true?
a. They lack sclerenchyma tissue. b. They have a well-developed vascular cambium. c. They do not produce bark. d. Their lateral meristems give rise to wood. e. Secondary growth occurs rather slowly.