Which type of tissue constitutes most of the wood of a tree trunk?
A. dermal tissue
B. parenchyma tissue
C. collenchyma tissue
D. sclerenchyma tissue
E. vascular tissue
D. sclerenchyma tissue
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Which statement best describes what ultimately happens to the chemical energy that is not converted to new biomass in the process of energy transfer between trophic levels in an ecosystem?
A) It is undigested and winds up in the feces and is not passed on to higher trophic levels. B) It is used by organisms to maintain their life processes through the reactions of cellular respiration. C) Heat produced by cellular respiration is used by heterotrophs for thermoregulation. D) It is eliminated as feces or is dissipated into space as heat, consistent with the second law of thermodynamics. E) It is recycled by decomposers to smaller and smaller forms until it finally breaks down to form soil.
In receptor-mediated endocytosis the proper sequence of event is:
a) primary lysosome exocytoses, digests food outside cell, food units absorbed by channels in plasma membrane. b) ligand-receptor binding, capping, fuse with endosome, secondary lysosome, digestion, absorption. c) capping, ligand-receptor binding, fuse with endosome, secondary lysosome, digestion, absorption. d) ligand-receptor binding, capping, secondary lysosome, digestion, absorption, tertiary lysosome. e) none of the above.
A normal red blood cell count range is __________
per microliter. a. 3,000–6,750 b. 20,000–100,000 c. 250,000–300,000 d. 1.6–3.2 million e. 4.8–5.4 million
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