The lipopolysaccharide (LPS) layer is found ONLY in the cell walls of
A) gram-positive Bacteria.
B) gram-negative Bacteria.
C) Archaea.
D) Eukarya.
Answer: B
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Bacmids:
A. are plasmids used in bacteria to express genes. B. are circular DNA that includes the baculovirus genome and sequences that allow for replication in E. coli. C. contain par genes that are recognized by a site-specific recombinase. D. are useful shuttle vectors for expressing genes in bacteria and yeast. E. are also called multicapsid nucleopolyhedroviruses.
The scientist(s) given credit for disproving the theory of spontaneous generation is/are
A. Rudolf Virchow. B. Robert Hooke. C. Mathias Schleiden and Theodore Schwann. D. Louis Pasteur. E. Antony van Leeuwenhoek.
Pollen grains develop in which structure?
a) the anther b) the stigma c) the filament d) the carpel
You discover a new species of bacteria that grows in aquatic environments with high salt levels. While studying these bacteria, you note that their internal environment is similar to the salt concentrations in their surroundings
You also discover that the internal salt concentrations of the bacteria change as the salt concentration in their environment changes. The new species can tolerate small changes in this way, but dies from large changes because it has no mechanism for altering its own internal salt levels. What type of homeostatic mechanism is this species using to regulate its internal salt levels? A) conformation B) regulation C) integration D) assimilation