Which of the following defines a hypothesis?
a. A suggested and testable explanation for an event
b. A form of logical thinking based on observations
c. A description of a behavior or natural occurrence
d. A research method that relies on experiments
a. A suggested and testable explanation for an event
Hypothesis is a suggested and testable explanation for an event.
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Which of the following events is believed to have occurred first?
a. endosymbiotic origin of mitochondria b. origin of cyclic pathway of photosynthesis c. endosymbiotic origin of chloroplasts d. origin of noncyclic pathway of photosynthesis
In an experiment on wayfinding, indigo buntings were housed in outdoor cages with blotting paper
walls and inkpads on the floors. Which of the following facts demonstrated to researchers that the indigo bunting uses the positions of stars to orient its migration?
a. The birds' inky feet made prints indicating the direction in which they attempted to fly. b. In spring the inky footprints were mostly on the northern side of the cage. c. In fall the inky footprints were mostly on the south side of the cage. d. On cloudy nights the footprint patterns were random. e. In spring and fall, the anterior pituitary of the bird's brain generated a series of hormonal changes.
Which of the following directors of embryonic development can be found within unfertilized eggs of protostomes?
A. mRNAs transcribed from embryonic genome B. bindin proteins C. tissue-specific proteins D. cytoplasmic determinants
What is the adaptation hypothesis?
A) The phage mutates so it can't infect bacteria any longer. B) The phage stimulates the bacteria to mutate to become immune to the phage. C) The phage and bacteria both mutate so the phage becomes less virulent. D) The phage mutates to infect bacteria more effectively. E) The bacteria will mutate so it can become an auxotroph.