Please choose the reason why gas gangrene infections can be treated with oxygen therapy successfully.
A) High pressure oxygen is delivered to the infected tissue, creating an unfavorable habitat for anaerobic Clostridium.
B) Oxygen poisons the clostridial cells.
C) The oxygen delivery produces a radioisotope of oxygen within the tissue, destroying the necrotic tissue.
D) The oxygen, delivered in low concentration, creates an anaerobic environment in which the Clostridium does poorly.
E) The oxygen reacts with water within the cell producing hydrogen peroxide, which kills the bacterial cells.
A) High pressure oxygen is delivered to the infected tissue, creating an unfavorable habitat for anaerobic Clostridium.
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Centromeres are:
A. sequences on the eukaryotic chromosome that function as an attachment point for proteins linking the chromosome to the mitotic spindle. B. sequences at the ends of the eukaryotic chromosome that add stability to linear DNA sequences. C. the sites at which replication initiates in bacteria. D. sequences in the bacterial chromosome at which the kinetochore forms. E. GC-rich sequences that code for the proteins forming the kinetochore.
The larger the initial size of a population, the faster it can reach K
a. true b. false
The human immunodeficiency virus (HIV) primarily destroys which cells?
a. B b. neutrophils c. T1 d. helper T and macrophages e. suppressor T
Color blindness is an X-linked trait in humans. If a color-blind woman marries a man with normal
vision, the children will be a. all color-blind daughters, but normal sons. b. all color-blind sons, but carrier daughters. c. all normal sons, but carrier daughters. d. all color-blind children. e. all normal children.