Which ECM molecule provides structure while allowing certain tissues to expand and contract (e.g., lungs during breathing, intestine during digestion)?
A. collagen
B. elastin
C. fibronectin
D. laminin
E. glycosaminoglycans
B. elastin
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The lumen of a transverse tubule is occupied by
A. extracellular fluid. B. cytoplasm. C. actin. D. myosin. E. sarcomeres.
Clara has alkaptonuria. Her symptoms include back spasms, dark urine, arthritis, hearing loss, kidney stones, heart valve damage, and darkened ear tips. This condition is therefore
A) genetically heterogenic. B) pleiotropic. C) dominant. D) epistatic.
In a lake, the open sunlit water with its suspended phytoplankton is referred to as which zone?
a. pelagic b. limnetic c. littoral d. profundal e. benthic
When the predator population is above the prey isocline, the prey population is
a. increasing b. decreasing c. neither increasing nor decreasing