Which is true regarding release of the T4 bacteriophage?
a. T4 enzymes compromise the cell membrane and peptidoglycan, causing lysis of the host cell.
b. Cro allows the expression of release proteins, leading to host-cell lysis.
c. Newly assembled T4 phages are released via a secretion apparatus.
d. T4 phages exit via budding, assembling an envelope from the cell membrane.
Answer: A
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Some ecologists specialize in endangered species. Because the emphasis of their studies would involve counting members of the same species in an area, which branch of ecology would this job fall under?
a. organismal ecology b. community ecology c. population ecology d. ecosystem ecology
______ is the presence of small numbers of viruses in circulating blood
Fill in the blank(s) with the appropriate word(s).
A good hypothesis:a
can be proven to be true. b. is falsifiable. c. can only be tested once. d. is a statement of fact. e. represents important conclusions.
Which statement regarding exotoxins and endotoxins is true?
A. Endotoxins and exotoxins are highly immunogenic, allowing for the development of protective antibodies and vaccines. B. Endotoxin has targeted activity, whereas exotoxins have systemic effects when released. C. Endotoxin is released from the cell wall of dead bacteria, whereas exotoxin is released from live bacteria. D. Endotoxins and exotoxins bind to specific receptors on a bacterial cell, leading to the pathological events associated with the toxins.