Based on these LD50 values, which microbe is the most virulent? Assume each bacterium enters through the appropriate portal of entry.
A) E. coli O157-1000 cells
B) Cryptosporidium-50 cells
C) Shigella-10 cells
D) Vibrio cholerae-108 cells
Ans: C) Shigella-10 cells
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All of the following circular DNAs exhibit theta replication except
A) bacteria. B) mitochondria. C) chloroplasts. D) plasmids. E) protists.
Tobacco plants have had a gene from fireflies inserted into them which makes them glow. These tobacco plants would be considered:
A) mutants. B) vectors. C) transgenic organisms. D) clones.
In generalized transduction, viruses carry random DNA sequences from one cell to another.
Answer the following statement true (T) or false (F)
Which of the following statements about actin is false?
(a) ATP hydrolysis decreases actin filament stability. (b) Actin at the cell cortex helps govern the shape of the plasma membrane. (c) Actin filaments are nucleated at the side of existing actin filaments in lamellipodia. (d) The dynamic instability of actin filaments is important for cell movement.