Until the late 1970s, there was no "Domain" as the broadest category in taxonomy. Instead, there were five kingdoms: Protista, Plantae, Fungi, Animalia, and Monera, which included all bacteria-like organisms. Researchers proposed the domains to distinguish between the bacteria-like organisms. Which information supported the domain level, and subsequent domains of Bacteria, Archaea, and Eukarya?
A. More complex emergent properties developed after organisms were originally categorized into kingdoms.
B. Organisms in the Bacteria and Archaea domains have a nucleus, whereas eukaryotes do not.
C. Cell shapes of bacteria and archaea were found to be more distinct, after microscope technology improved.
D. Differences in DNA among the existing kingdoms showed a need for a broader naming category.
E. Evolution led to new adaptations and diversity of organisms.
D. Differences in DNA among the existing kingdoms showed a need for a broader naming category.
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Which of the following features are used to identify chordates?
A. A notochord B. A hollow nerve cord C. A tail during embryonic development D. All of the above are features used to identify chordates.
Movement of the forearm so that the palm faces outward is called
a. supination. b. pronation. c. abduction. d. adduction. e. flexion.
A bacterial operon ________
A) is capped at the 5' end and carries a poly-A tail at the 3' end B) contains information for one protein product C) contains information for more than one protein product D) is void of start (AUG) and termination (UAA, UGA, UAG) triplets E) None of the answers listed is correct.
You count 153 colonies on the 1:100,000 poor milk sample plate from the Bacterial Examination of Milk exercise. Calculate the number of bacteria per ml of milk (CFU/ml).
A) 1.53 x 10-8 CFU/ml B) 1.53 x 106 CFU/ml C) 1.53 x 108 CFU/ml D) 1.53 x 10-7 CFU/ml E) 1.53 x 107 CFU/ml