What kind of organisms likely perished due to the increase of oxygen in the atmosphere three billion years ago?
a. heterotrophs
b. cyanobacteria
c. obligate aerobes
d. obligate anaerobes
e. facultative anaerobes
d
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Why do individuals with genetic defects that prevent neutrophil or macrophage development usually die at an early age? Be specific and detailed in your answer to demonstrate your knowledge on the role of these cells in the immune system
What will be an ideal response?
The oncogene that causes Burkitt lymphoma results from a
A) translocation that moves a proto-oncogene next to an antibody gene. B) point mutation in a proto-oncogene. C) virus that inserts next to a proto-oncogene. D) deletion of an anti-oncogene.
Which of the following is NOT characteristic
of sensation? a. Some sensory receptors are activated only by chemicals. b. Nerve impulses mediating each of the senses are essentially the same. c. Sensory neuron activity follows the all-ornone law. d. All organisms use the same sense organs to perceive their environments. e. All sensory receptors convert stimulus energy into action potentials
Which bacteria could be responsible for hemolytic uremic syndrome (HUS)?
A. enterotoxigeic strains of E. coli B. Salmonella C. Shigella dysenteriae D. E. coli 0157:H7 E. enteroinvasive E. coli