Phenylalanine is a(n) ____ and the starting point for a network of metabolic pathways
a. lactase precursor molecules
b. carbohydrate by-products of respiration
c. essential amino acid
d. sub-types of hemoglobin
e. phenylthiocarbamides
c
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The malleus, incus, and stapes are all part of the:
A. inner ear. B. middle ear. C. outer ear. D. cochlea.
What key words does the question contain and what do they mean?
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. When Schmidt-Nielsen and his colleagues followed a "pulse" of air through the respiratory system of an ostrich, it took two full cycles of inhalation and exhalation for this pulse to pass through and be exhaled. 2. Chemoreceptors for oxygen normally play the most important role in regulating breathing rate. 3. Smaller mammals typically have higher ventilation rates than large mammals. 4. The shape of the oxygen-hemoglobin dissociation curve is a straight line. 5. Asthma attacks result from contraction of the muscles surrounding the bronchioles.
The __________ is a sedimentary cycle; Earth's crust is the largest reservoir, and there is no major
gaseous form. Fill in the blank(s) with the appropriate word(s).