The axolotl, an aquatic amphibian, primarily uses its ________ for gas exchange.
A. tracheal tubes
B. parabronchi
C. gills protected by an operculum
D. lungs
E. external gills
Answer: E
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The clonal selection theory states that each antigen-reactive B cell or T cell has a cell surface receptor for a single antigen epitope
Indicate whether the statement is true or false.
In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment, which one of the following would you NOT expect to find in the collection flask?
A. urea B. amino acids C. ATP D. adenine E. formaldehyde
If the age structure of a country's population is balanced, what prediction can be made about the near future?
A. The birth rate will decline. B. The death rate will decline. C. The population will not increase rapidly. D. The population will increase rapidly. E. The demographic transition will begin.
What is the difference between genetic dissection and genome sequencing?
A) Genetic dissection reveals information about one gene at a time and genome sequencing reveals information about all the genes in a genome at once. B) Genetic dissection experiments can be accomplished in any species and genome sequencing is only possible in model organisms. C) Genetic dissection depends on the availability of mutations in model organisms and mutations are of no use in the study of genomes by genome sequencing. D) The genetic dissection approach is affordable and genome sequencing is prohibitively expensive.