What can be assumed from these results?
In the Ames test, mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine. Therefore, these bacteria require histidine in the growth plate to survive. A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that Salmonella typhimurium is living on a histidine-free growth plate.
A. The newly synthesized compound induces a mutation in the bacteria.
B. The bacteria no longer produce histidine.
C. The bacteria produce histidine.
D. The newly synthesized compound induces a mutation in the bacteria and the bacteria no longer produce histidine.
E. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine.
E. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine.
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Energy released by transferring electrons along the electron transport chain is stored as potential energy in the form of:
A. ATP. B. a proton gradient. C. redox couples. D. ATP synthase. E. coenzyme Q.
The peripheral nervous system is composed of the ____
a. brain and spinal cord b. brain and somatic nerves c. spinal cord and somatic nerves d. spinal nerves and cranial nerves e. spinal cord and spinal nerves
Why is back pain so common in humans? What will be an ideal response?
A wolf eats a rabbit that eats grass. The wolf is a(n) ________
A) consumer B) detritivore C) producer D) autotroph