The Carboniferous Period is extremely significant to our current society because
A. mammals diversified.
B. human evolution began in the period.
C. plants and animals first adapted to a terrestrial environment during this period.
D. the Carboniferous forests turned into the coal that fuels modern society.
Answer: D
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A researcher is studying the integral membrane protein "mysteriase" and chooses to perform an experiment similar to that performed by Frye and Edidin. The researcher fuses a mouse cell expressing mysteriase with a human cell. The fused cell is incubated at 37°C prior to being cooled to 0°C and labeled with a fluorescent antibody against mysteriase. When observed with a fluorescent microscope, mysteriase is observed to remain on one side of the fused cell. What is the most likely explanation for this surprising observation?
A. Mysteriase is a flippase enzyme that enhances lipid flip-flop rather than lipid lateral movement. B. Mysteriase is bound to the cytoskeletal filament. C. Mouse cells are less fluid than human cells. D. There is an error in the experimental procedure because this result is impossible. E. Mysteriase rigidifies the plasma membrane.
Forensic technicians unearth a skeleton from a shallow grave. They extract a tiny amount of DNA from the pulp found in the teeth. How could they obtain sufficient DNA for an analysis of the victim's genes?
A. Subject the DNA to gel electrophoresis. B. Use a nucleic acid probe. C. Subject the specimen to amniocentesis. D. Use the polymerase chain reaction. E. Subject the DNA to restriction enzymes.
Microbial contamination always results in infection.
Answer the following statement true (T) or false (F)
Identify a greenhouse gas that can be produced primarily by microorganisms.
A) oxygen B) propane C) sulfur D) methane