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.
B
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A. size B. number C. dry weight D. total weight E. total utilization of materials
What is the best way to distinguish male from female?
A) Males are larger. B) Males are more brightly colored. C) Males are more aggressive. D) Males produce motile gametes. E) Females produce offspring.
The highest blood pressure that is reached during the contraction phase of the heart cycle is:
What will be an ideal response?
On what basis was life divided into three domains?
A. cytochrome c sequence data B. the presence or absence of a nucleus and organelles C. presence or absence of mammary glands D. rRNA sequence data E. mitochondrial DNA sequence data