Theoretically, P. bursaria can obtain zoochlorella either vertically (via the asexual reproduction of its mother cell) or horizontally (by ingesting free-living Chlorella from its habitat)
Consider a P. bursaria cell containing zoochlorellae but whose habitat lacks free-living Chlorella. If this cell subsequently undergoes many generations of asexual reproduction, if all of its daughter cells contain roughly the same number of zoochlorellae as it had originally contained, and if the zoochlorellae are all haploid and identical in appearance, then what is true? The zoochlorellae _____.
A) also reproduced asexually, at an increasing rate over time
B) also reproduced asexually, at a decreasing rate over time
C) also reproduced asexually, at a fairly constant rate over time
D) reproduced sexually, undergoing heteromorphic alternation of generations
C
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Which of the following is not true about leprosy?
A. it is caused by Hansen's bacillus in honor of its discoverer B. the leprosy bacillus is highly virulent C. armadillos harbor a genetically identical M. leprae D. early signs appear as small, spotty lesions colored differently than the surrounding skin E. the number of new cases in the US each year is about 100 to 200
For biologists studying a large flatworm population in the lab, which Hardy-Weinberg condition is most difficult to meet?
A) no selection B) no genetic drift C) no gene flow D) no mutation E) random mating
The conversion of physical or chemical stimuli into nerve impulses is known as:
A. sensory transduction B. sensory reception C. motor response D. cellular response
Which one of the following is not an example of combinatorial control of eukaryotic gene expression?
A. The HAT activity of the yeast Gcn5 protein alters chromatin structure. B. Fos-Jun heterodimers bind DNA with higher affinity than Fos-Fos or Jun-Jun homodimers. C. Two regulatory proteins that form homo- and heterodimers bind to three different regulatory sites. D. Expression of the even-skipped gene product of the fruit fly is differentially controlled by the uneven distribution of four transcription factors.