Differentiate between endotoxins and exoenzymes
What will be an ideal response?
ANSWER: Endotoxins are lipopolysaccharides released when a bacterium dies and lyses. These
lipopolysaccharides cause disease. Exoenzymes are proteins released by some bacteria that
can rupture host cells or digest extracellular materials such as collagen.
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The function of leghemoglobin in root nodules is to
A) bind oxygen. B) chelate iron. C) produce iron. D) produce nitrogen.
Which of the following name two mutagens that would be classified as base analogs?
A) ultraviolet light and cosmic radiation B) 5-bromouracil and 2-amino purine C) acridine orange and proflavin D) hydroxyurea and peroxidase E) ethylmethane sulfonate and ethylmethylketone peroxide
Biochemical tests include all of the following except
A. tests for the presence of specific enzymes. B. antibiotic sensitivity tests. C. ribotyping tests. D. gas production tests. E. sugar fermentation tests.
Conifers transmit chloroplast only through pollen. This:
a. leads to parthenogenesis. b. inhibits parthenogenesis. c. leads to recombination in chloroplast DNA when ovule and pollen chloroplast merge. d. leads to imprinting of conifer nuclear genes.