The pathogenicity of primary tuberculosis is due to the fact that the mycobacteria

A. are not phagocytized.
B. prevent fusion of lysosomes with vesicles.
C. form a pseudomembrane.
D. destroy helper T cells.
E. are carried by macrophages to a variety of sites.


Answer: B

Biology & Microbiology

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All of the following statements about the periplasmic space are true except:

A. It contains hydrolytic enzymes and binding proteins involved in nutrient acquisition. B. It is located between the plasma membrane and outer membrane of gram-negative bacteria. C. It is found only in gram-positive bacteria. D. All of the choices are true.

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Horses and donkeys can mate successfully to produce mules, which are always sterile. Which genetic isolating mechanism prevents horses and donkeys from becoming a single species?

A) Hybrid infertility B) Mechanical isolation C) Behavioral isolation D) Temporal isolation E) Hybrid inviability

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Gene expression involves the process of transcription and translation

Indicate whether the statement is true or false

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Which of the following organs is not found in the abdominal cavity?

a. Pancreas b. Large intestine c. Liver d. Stomach e. Bladder

Biology & Microbiology