Which region of the ? phage genome enables the linear chromosome to circularize when it enters a host cell?
A) cohesive (cos) site
B) IS10
C) early operators
D) integrase (int) gene
E) excisionase (xis) gene
A
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Bacteria reproductive strategies include all of the following EXCEPT
A. budding. B. multiple fission. C. binary fission. D. formation of mutinucleoid filaments that break apart into uninucleate spores. E. fusion of two bacterial cells that then split into four uninucleate cells.
Which characteristic distinguishes animals from plants and fungi?
1.Eukaryotic cells 2.Multicellular 3.Cells lack cell walls 4.Motile at some point in the life cycle
As a botanist working for a field museum, you spend many hours in the field looking for new species. On a recent trip you may have discovered a new plant species. Your observations of the new plant include small leaves with a single, unbranched vein and roots that seem to be simple extensions of the stem. Your new plant species is probably a(n):
A. Gnetophyte B. Fern C. Liverwort D. Angiosperm E. Lycophyte
Genetic variability will not occur among offspring if crossing over does not occur during prophase I of meiosis.
a. true b. false