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

Biology & Microbiology

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Ambiguously worded answer choices _____.

Fill in the blank(s) with the appropriate word(s).

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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.

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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.

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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.

Biology & Microbiology