Which of the following is NOT involved in altering the resistance of the airway to air movement?
A) secretion of mucus into the airway
B) transpulmonary pressure
C) contractile activity of bronchiolar smooth muscle cells
D) tractive forces exerted on the airway by surrounding tissue
E) pulmonary surfactant concentration
Answer: E) pulmonary surfactant concentration
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Positive cooperativity would most likely be observed when a protein is:
A. a single polypeptide with a Kd = 10-10. B. a single polypeptide with three ligand-binding sites of increasing Kd values. C. comprised of two identical subunits, each of which binds ligand. D. comprised of two ligand-binding sites where the Kd for the second site decreases after the first ligand binds. E. comprised of subunits A and B, where ligand binding to A facilitates ligand binding to B.
AluI is an example of which type of transposable element commonly found in the genome of humans?
A) LINE elements B) SINE elements C) P elements D) Copia elements E) Ty elements
Which of the following statements is not true concerning root hairs?
a. They are tubular extensions of epidermal cells. b. They are continually formed in the area of cell maturation. c. They are quite numerous. d. They greatly increase the absorptive capacity of roots. e. They are long lived .
Please match the technologies with the statements that most accurately describe them to test your understanding of the methods and characteristics used in classifying bacteria. These tests use the presence or absence of biochemical processes and enzymes to group organisms
A) Morphology B) Bacterial physiology/biochemistry C) Serological analysis D) Genetic techniques