When does endospore formation commence?
A) when bacterial growth ceases due to limitation of an essential nutrient
B) when the bacterium is undergoing binary fission
C) when bacteria are dividing exponentially
D) following bacterial death
Answer: A
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Chloroplasts ____
a. resemble photosynthetic bacteria b. utilize the same pigments regardless of what organism they are in c. apparently evolved from mitochondria d. utilize DNA derived from the nucleus e. are found in prokaryotes
The cytoskeleton
a. extends between the nucleus and the plasma membrane. b. is found within the nucleus. c. is associated with only certain cell structures. d. is found within organelles. e. is found in all animal cells but not in cells with cell walls.
Fred Griffith discovered that when he injected mice
with a mixture of dead pathogenic S cells and living harmless R cells of Streptococcus pneumoniae a. the harmless dead S bacteria became pathogenic and killed the mice. b. the mice died, and their bodies teemed with living pathogenic S strain cells. c. the pathogenic S strain was transformed into the harmless R strain. d. the mice lived, and their bodies teemed with living harmless R strain cells, and the pathogenic S strain cells were eliminated. e. all of these occurred.
Red muscles are designed to contract
a. quickly. b. quickly and for short periods. c. slowly. d. slowly for short periods. e. slowly for long periods.