What does Vibrio fischeri use to communicate?
A. Bioluminescence
B. Physical contact
C. Secreted chemicals
D. Electrical impulses
Ans: C. Secreted chemicals
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A particular neuron does not release neurotransmitters into the synaptic cleft. Further investigation shows that this cell does not respond to calcium ions that are necessary for t- and v-SNARE complex interaction. The most likely problem is associated with the function of
A) synaptic boutons. B) acetylcholinesterase. C) synaptotagmin. D) GABA receptors. E) calcium ions.
Which of the following stain as either Gram-positive or Gram-negative?
a. Archaea b. Bacteria c. Archaea and Bacteria d. neither Archaea nor Bacteria e. Methanogens
The endomembrane system did not start developing
until the atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from low oxygen to high oxygen. d. firmly in the age of aerobes. e. all of these.
A gene is
A) a stretch of DNA coding for a polypeptide chain (sequence of amino acids). B) a microscopic, threadlike body within a cell. C) any heritable behavioral, morphological, or physiological trait of an organism. D) all of the DNA in a cell.