Drugs that act by mimicking the normal substrate of an enzyme, thereby blocking its active site, are called ________.
A. blockers
B. inhibitors
C. competitive inhibitors
D. noncompetitive inhibitors
Answer: C
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Which of the following is illustrated by one bird species evolving into five other species, each with their own unique characteristics?
a. adaptive radiation b. dispersal c. adaptation d. descent with modification
You have made a specific DNA probe that will bind to a key sequence on the DNA of Neisseria gonorrhoeae, allowing your company to market a gonorrhea test kit that can be used to identify the bacterium in genital tract specimens. However, upon testing it out against a known Neisseria gonorrhoeae culture, you find that it does not work. Which of the following is a possible explanation for this negative result?
A. You forgot to incubate the test at the 75°C temperature required for hybridization. B. You forgot to add the mRNA to the DNA probe sample. C. You forgot to label the probe sequence with a reporter molecule. D. You forgot to digest the probe with restriction endonucleases.
Scientific facts rely on
1.opinion. 2.prediction. 3.verifiable information. 4.critical thinking.
To take advantage of ecotourism, a resort is built near a coral reef so that tourists can observe the spawning that occurs shortly after a full moon. As an added benefit, several species of colorful fishes are attracted to the area
Tour boats go out nightly and shine large spotlights to attract the fish. Tourists are enchanted by the display of fishes but have begun to question why spawning among the corals has ceased. What is the probable cause for the lack of spawning? A) The spotlights are causing the corals to spawn during the day rather than at night. B) The tourists are too loud. C) Corals time their spawning by the phase of the moon; spotlights mimic the full moon, so spawning can't occur. D) The fish are eating the spawn. E) The fish are releasing chemical signals that interfere with spawning among the corals.