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
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Gene expression involves the process of transcription and translation
Indicate whether the statement is true or false
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.
Which of the following organs is not found in the abdominal cavity?
a. Pancreas b. Large intestine c. Liver d. Stomach e. Bladder
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