Based on the morphological species concept, why would you assume that there are many different species of rat
snakes?
What will be an ideal response?
ANSWER: The rat snake is present in many diverse areas of the country. Individual snakes from these
different locations have different banding patterns and do not resemble each other. Based
on a morphological approach, one would assume that they are different species. In reality,
they are subspecies that could successfully mate if brought to a common location
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What aspect of cellular respiration occurs in the cytoplasm in eukaryotic cells?
A. Glycolysis B. Pyruvate oxidation C. The Krebs cycle D. The electron transport chain E. ATP synthesis
A pharyngeal specimen is inoculated on cystine-tellurite blood agar, modified Tinsdale agar, and MacConkey agar. After 48 hours of incubation, black colonies with a brown halo are observed on the Tinsdale agar and gray colonies are isolated from the cystine-tellurite agar. However, no growth is observed on the MacConkey agar. Which one of the following statements explains this discrepancy?
a. The MacConkey agar is most likely ex-pired. b. The MacConkey agar should be incubated an additional 24 hours to observe growth. c. The pH of the media may be altered, causing an environment that is too acidic for the organism to grow. d. No discrepancy is present; this organism does not grow on MacConkey agar.
What is the name of the precursor molecule used in nucleic acid synthesis?
What will be an ideal response?
What Gram reaction do you expect from acid-fast bacteria?
a. Gram-positive b. Gram-negative c. Both gram-positive and gram-negative d. Can't tell