What are the five ways that cells regulate flow of molecules through their metabolic pathways?
What will be an ideal response?
1. by controlling the enzyme concentration
2. by producing modulators (allosteric and covalent)
3. by using two different enzymes to catalyze reversible reaction
4. by isolating enzymes within intracellular organelles (compartments)
5. by maintaining an optimum ratio of ATP to ADP
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A typical synaptic delay lasts for approximately ____
a. 0.5 to 1 millisecond b. 5 milliseconds c. 10 milliseconds d. 25 milliseconds e. 0.5 to 1 second
Laryngospasm is defined as:
A) aspiration of foreign material. B) spasmodic closure of the vocal cords. C) voluntary closure of the glottic opening. D) spontaneous collapsing of the trachea.
What events occur during the process of accommodation?
a. An increased tension on the suspensory ligament (zonular fibers) of the lens b. Dilation of the canal of Schlemm c. Flattening of the lens d. Focusing of light from close objects e. Relaxation of the ciliary muscle
Which of the following is a blood clotting disorder?
A) polycythemia B) hemophilia C) leukocytosis D) leukopenia E) anemia