Pathogenic microbes are the only kind of microbes capable of ruining an experiment.
A) True
B) False
B) False
Feedback: Any unwanted microbe is capable of ruining an experiment
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Which of the following are NOT important in chemical synapses?
A. gap junctions B. neurotransmitters C. specific neurotransmitter receptors D. secretory vesicles E. voltage-gated Ca2+ channels
The endosymbiont hypothesis proposes all of the following EXCEPT
A. chloroplasts originated when a nucleated cell engulfed a cyanobacterium. B. prokaryotes evolved when an aerobic bacterium engulfed a cyanobacterium. C. a nucleated cell engulfed an aerobic bacterium which evolved into mitochondria. D. mitochondria and chloroplasts were once free-living bacteria.
Which of the following is the usual trigger for seed germination?
A) water B) warm temperatures C) oxygen D) sunlight
Neural crest cells at the dorsal surface of the neural tube
A. form the notochord. B. differentiate into the brain. C. form the overlying ectoderm. D. migrate to many different regions of the body. E. control the segmentation of somatic mesoderm.