Production of exotoxin A and several proteolytic enzymes and hemolysins are factors that contribute to the pathogenicity of which organism?
a. P. aeruginosa
b. Burkholderia cepacia
c. Ralstonia pickettii
d. Burkholderia mallei
A
Although P. aeruginosa is an environmental inhabitant, it is also a successful opportunistic pa-thogen. Factors that contribute to pathogenicity include the production of exotoxin A, which kills host cells by inhibiting protein synthesis, and the production of several proteolytic enzymes and hemolysins that destroy cells and tissue. On the bacterial cell surface, pili may mediate attachment to host cells. Some strains produce alginate, a polysaccharide polymer that inhibits phagocytosis and contributes to infection potential in patients with cystic fibrosis.
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Plants adapted to low-nutrient environments are characterized by
A) a high growth rate. B) decreased root production. C) increased leaf longevity. D) faster growth when more nitrogen is available.
The cells in the ________ layer of the leaf contain the majority of a leaf's chloroplasts
Fill in the blank(s) with correct word
Which of the following is a unique organelle found within some protists but not in higher animal cells?
A. Contractile vacuole B. Golgi apparatus C. Endoplasmic reticulum D. Mitochondrion
Which of the following chemical substances contributes to the unique characteristics of acid-fast bacteria?
A. N-acetylglucosamine B. peptidoglycan C. lipoteichoic acid D. endotoxin E. mycolic acid