All of the following can make interpreting the Gram stain difficult except
A) testing bacteria that have a waxy cell wall.
B) the culture is between 24 and 48 hours old.
C) testing bacteria that are forming endospores.
D) the culture is more than 48 hours old and contains damaged cells.
E) testing bacteria with especially resistant cell walls.
Answer: B
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The zipper-like connection between paired homologs in early prophase is known as a
A) spindle fiber. B) synaptic junction. C) synaptonemal complex. D) chiasma. E) None of the choices is correct.
Which group of angiosperms includes grasses and lilies?
a. Monocots b. Dicots c. Basal angiosperms d. Eudicots
A component of bacteria that are often used in biotechnology are
a. operons. b. introns. c. exons. d. polypeptides. e. plasmids.
Chemical cycling may involve all but which of the following?
A. a biotic community in which chemicals move through food chains B. a reservoir unavailable to producers C. an exchange pool as a source from which organisms can acquire chemicals D. a geological component, in which chemicals move through the soil or the air E. All of the choices are correct.