Some cells, such as those in mature muscle, do not divide; these cells are arrested in ________
a. G1
b. S
c. G2
d. M
a
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One of the major categories of receptors in the plasma membrane reacts by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this?
A) G protein-coupled receptors B) ligand-gated ion channels C) steroid receptors D) receptor tyrosine kinases
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.
The first United States Marine Biological Laboratory was started by:
a. Charles Wyville Thomson. b. Sir Alistair Hardy. c. Charles Darwin. d. Louis Agassiz. e. Alexander Agassiz.
Which of the following laboratory procedures is used for culturing animal viruses in the laboratory?
A) cell cultures B) broth cultures C) embryonated eggs D) both cell cultures and embryonated eggs E) synthetic cytoplasm