Which of these events leads to all of the others in a pyrogenic (fever) response?
A) The hypothalamus releases prostaglandins.
B) Endotoxin is released from the cell wall of gram-negative bacteria.
C) The body's thermostat is set to a higher level, and fever occurs.
D) IL-1 is released by macrophages.
E) IL-1 travels via the blood to the hypothalamus.
Ans: B) Endotoxin is released from the cell wall of gram-negative bacteria.
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Which of the following reflects sequence elements conserved in pre-mRNA splice sites?
A. CTAG at the 3' end of the 5' exon B. GAAG at the 3' end of the intron C. AG at the 5' end of the intron D. G at the 5' end of the 3' exon
) A prokaryotic organism is isolated from a glacier, where it was thriving. Based on your knowledge of the plasma membrane, you would expect to find a predominance of
A) largely saturated fatty acids. B) equal amounts of saturated and unsaturated fatty acids, as long as the chain was close to 12 carbons in length. C) cell wall to define the cell because the cell membrane would not be present. D) largely unsaturated fatty acids. E) none of the above
Bacterial pathogens may be controlled by ________, which are viruses that specifically infect and lyse the bacterial host.
Fill in the blank(s) with the appropriate word(s).
A particular cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a(n) ________ cell
A) bacterial B) plant or bacterial C) plant, but not an animal D) animal, but not a plant E) plant or animal