How does the toxin from Clostridium tetani produce its action?
A. it fuses irreversibly to neurons, blocking release of acetylcholine at synaptic clefts.
B. the smaller polypeptide of its toxin can block the release of inhibitory neurotransmitters by inhibitory neurons in the central nervous system.
C. it is a pyrogenic toxin, which triggers a diffused rash and, later, sloughing of skin.
D. it destroys tissues, including muscle and fat.
E. Antibodies to the toxin bind the neuromuscular junctions in skeletal muscle preventing relaxation.
Answer: B
You might also like to view...
During DNA replication Okazaki fragments are linked together by________, an enzyme that creates phosphodiester bonds between nicked fragments of DNA
A) exopolymerase B) DNA gyrase C) topoisomerase D) DNA ligase
A commercial modification of the disk diffusion test is called the
A. A test. B. B test. C. C test. D. D test. E. E test.
Indicate the differences between protostomes and deuterostomes, and list the phyla of animals in each group.
What will be an ideal response?
Inversions may be difficult to detect because they
A) never visibly change chromosome banding patterns. B) increase recombination in heterozygote’s. C) do not always cause an abnormal phenotype. D) normally are removed immediately in natural populations.