Some plant secondary metabolites are used as______________
a. fuel c. textiles
b. medicines d. flooring
B
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The first several cleavages after fertilization occur in the:
a. uterus cavity b. ovary c. vagina d. oviduct e. uterine wall
Which of the following is NOT part of the response of an airway to specific allergens that initiate an asthmatic response?
A) increased inflammatory response B) increased airway resistance C) increased secretion of mucus D) increased histamine release E) increased release of corticosteroids
In plants, the light-dependent reactions require
A. Calvin cycle enzymes. B. ATP. C. O2. D. glucose. E. NADP+.
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.