The disease referred to as melioidosis is caused by which one of the following?
a. P. aeruginosa
b. R. pickettii
c. B. mallei
d. Burkholderia pseudomallei
D
Infections caused by B. pseudomallei, which can survive in human macrophages, can range from being asymptomatic to severe. The disease is referred to as melioidosis; it has several forms, in-cluding formation of skin abscesses, sepsis and septic shock, abscess formation in several internal organs, and acute pulmonary disease.
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Phospholipase is an enzyme that cleaves the phosphate head group off a phospholipid molecule. The plasma membrane is not, however, permeable to the enzyme
Imagine a cell where phospholipid A is present in the monolayer facing the exterior of the cell, and phospholipid B is present in the monolayer facing the interior of the cell. After adding phospholipase to the medium in which the cell is growing, what would you expect to find in the fluid surrounding the cell? A. the phosphate head group from phospholipid A only B. the phosphate head group from phospholipid B only C. phosphate head groups from both phospholipids A and B D. phosphate head groups from neither phospholipids A nor B
During photorespiration, which of the following molecules acts as a substrate for the rubisco enzyme?
A. CO2 B. O2 C. H2O D. N2
Homologous chromosomes usually have the same arrangement of genes along their length.
a. true b. false
Cells are typically small because _____.
A) a greater number of small cells can occupy any space compared to larger cells B) just like sand and gravel, smaller objects can pack together more tightly C) their volumes increase at a faster rate than the surface area D) small cells require less food than large cells