You find a unicellular organism that forms lobe-like pseudopodia. When you expose the cells to
cAMP, they aggregate into a slug like structure. Based on this information, you correctly conclude that
this organism is:
a. Entamoeba histolytica.
b. Dictyostelium discoideum.
c. Chaos carolinense.
d. Chlamydomonas.
e. Physarum polycephalum
B
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Uptake of food particles by trapping them within an invagination of the plasma membrane is called ________.
Fill in the blank(s) with the appropriate word(s).
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.
Bones at synovial joints are held in place by ____
a. tendons b. cartilaginous joints c. fibrous joints d. ligaments e. bone fragments
Peptide bond formation is catalyzed by an RNA molecule in
A) prokaryotes. B) eukaryotes. C) viruses. D) archaea. E) both prokaryotes and eukaryotes.