An antibiotic is added to a culture of E. coli, resulting in death of the cells. Bacteriophage are then added. Would the phage replicate in the E. coli cells? Why or why not?
A. Yes, because the machinery inside the cells is most likely still active, even though the cells are no longer living. The virus could use that machinery to replicate new virus particles.
B. No, because the virus would depend too much on having the active machinery of a living cell for its replication. Without the ability of the cell to try to replace what is lost/damaged/used as the virus goes through its life cycle, the virus couldn't reproduce effectively.
C. Yes, because viruses are capable of reanimating dead cells to force them to produce more virus particles.
D. No, because entry of the virus into the target cell is dependent on the cell being alive to conduct endocytosis of the virus.
B
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Answer the following statements true (T) or false (F)
1. The first bilateral animal emerged during the Ordovician Period. Fossils of this organism were discovered in South Africa. 2..The eukaryotic genome is comprised entirely of genes derived from Archean ancestors. 3. Although not well understood, the Cambrian Explosion most likely occurred due to changes in sea level and continental drift. 4. According to Thomas Malthus, food supplies tend to increase arithmetically while populations tend to increase exponentially, which means that populations will outgrow their food supply. 5. Selective breeding results from programs designed to modify traits in domesticated species.
The observations and research on aphid color changes can most directly be summarized in that
A. Koga and Fugatsu proved that the color change from red to green in aphids was ecologically favorable to survival. B. the method of paper fiber separation of pigment molecules showed that Ricketsiella bacteria were the source of the green coloration of aphids. C. species of organisms can be chemically diverse and affect each other, even among similar groups of aphids and bacteria. D. it turned out that the green appearance of aphids was because of the large amount of green Ricketsiella bacteria coating their bodies. E. All of the answer choices are correct.
The protein profiles for the Aa and AA individuals are
a. identical. b. similar. c. different.
Which of the following choices correctly identifies a reactant in the following chemical equation?
CO2 + H2O ? H2CO3 a. carbonic acid b. oxygen c. water d. sugar e. carbon monoxide