The cells wall of bacteria Z contains high concentrations of phospholipids along with proteins and relatively low amounts of lipopolysaccharide. When bacteria Z is gram stained, it will most likely be colored
A. pink.
B. purple.
C. blue.
D. clear; it does not retain any stain.
Answer: A
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Adaptive zones opened up for the dinosaurs after
a. early dinosaurs evolved a four-chambered heart. b. large fragments from an asteroid or comet hit multiple locations on Earth. c. volcanic eruptions and global climate change during the Cretaceous. d. reptiles became very large in size. e. all of these occurred.
The hindwing eyespots of the butterfly Bicyclus anyana responded to artificial selection for increased gold color in both or increased black color in both, but artificial selection could not produce increased gold in one spot and increased black in
the other. This is an example of ________. A) homoplasy B) heterochrony C) genetic linkage D) orthologous genes E) constraint
Which of the following statements about taxonomy is NOT true?
A. Homologous structures are derived from a single structure in the ancestor, although they may be adapted to different uses in the descendent species. B. Analogous structures are derived from a common ancestral structure to perform the same function. C. In cladistics, a common ancestor and all its descendents that share one or more derived traits are placed in a single clade. D. Biochemical data and the fossil record can be used to indicate the length of time since two species diverged from a common ancestor.
Which of the following is the best reason to classify Streptococcus in the Lactobacillales?
A) Gram reaction B) morphology C) fermentation of lactose D) rRNA sequences E) found in dairy products