Antibodies detected by reacting patient serum with rickettsial antigens, followed by incubation with an anti-immunoglobulm with a fluorescent tag, could be used to diagnose:
A. Rocky Mountain spotted fever.
B. Mycoplasma pneumonia.
C. stomach ulcers.
D. rheumatic fever.
Ans: A. Rocky Mountain spotted fever.
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Which primary succession event led to the formation of the tundra?
a. large tsunamis b. glacial retreat c. volcanic activity d. the breaking up of Pangaea e. large earthquakes
Which of the following secretes milk, sweat, saliva, or some other substance through a duct?
A. Connective tissue B. Endocrine gland C. Connective tissue D. Exocrine gland E. Microvillus
You compare homologous nucleotide sequences among several pairs of species with known divergence times. A pair of species that diverged 1 million years ago has two nucleotide differences, a pair that diverged 2 million years ago has four nucleotide
differences, and a pair that diverged 3 million years ago has six nucleotide differences. You have sequence data for another pair of species for which the divergence time is unknown. There are five nucleotide differences between them. Based on your clock, when did their line of ancestry diverge? A) 3.5 million years ago B) 3 million years ago C) 2.5 million years ago D) 2 million years ago
The chemical composition of the gases surrounding the Earth has changed substantially over the past 4 billion years. One notable change was due to the emergence of photosynthetic organisms. The process of photosynthesis increased the amount of what gas in the atmosphere?
A. Water vapor (H2O). B. Hydrogen sulfide (H2SO4). C. Carbon dioxide (CO2). D. Nitrogen (N2). E. Oxygen (O2).