A stool sample is obtained from a patient with diarrhea and fever. A Gram-negative bacillus that is an obligate anaerobe is isolated from the sample. Which of the following genera might it be a member of?
A. Bacillus
B. Bacteroides
C. Clostridium
D. Escherichia
E. Brucella
Answer: B
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The karyotype designation for an infant with a deletion in the short arm of chromosome 5 (cri du chat syndrome) is
____________________Fill in the blank(s) with the appropriate word(s).
Mutation is the only evolutionary mechanism that _____
A) does little to change allele frequencies B) is more important in eukaryotes than in prokaryotes C) happens in all populations D) has no effect on genetic variation
Septic shock due to gram-positive bacteria is caused by
a. A-B toxins. b. Lipid A. c. Membrane-disrupting toxins. d. Superantigens. e. Erythrogenic toxin.
Short, bristle-like structures that extrude from the cell surface are called
A) flagella. B) pili. C) mating bridges. D) fimbriae. E) cilia.