Salmonella and Shigella, both causes of diarrhea, can be distinguished by which of the following tests?
A) lactose fermentation
B) oxidase test
C) motility
D) urease test
E) pigment production
C
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You are conducting a long term study of ecosystem functioning in a freshwater lake. You and your field assistants gather data for many biotic and abiotic factors, including species diversity, water and benthic quality, and turbidity. Over the ten years of your study, you find that the abundance of water lilies is correlated with several other factors. When water toxicity and turbidity are high and water pH is abnormally low, water lilies quickly become scarce, followed by periods where fish, amphibians, and water birds are also scarce or absent. In years water nutrient levels are very high, water lilies quickly become abundant, followed by years where wading birds are scarce. From these data, you conclude that water lilies are __________.
A. an umbrella species. B. a keystone species. C. an endemic species. D. a flagship species. E. an indicator species.
T cell receptors can discriminate between self (MHC markers) and nonself (____)
Fill in the blank(s) with correct word
DNA sequences that do not code for proteins
A. All of the answer choices are correct. B. are nonfunctional pseudogenes. C. are structural, with repeated and translocated sections. D. regulate gene expression. E. transcribe mRNA, tRNA, and rRNA.
An acronym that describes sequences of a protein-coding gene that specify the amino acid sequence is ________.
What will be an ideal response?