Which of the following does NOT characterize proteins?
A) Their function depends on their three-dimensional shape.
B) They may be denatured or coagulated by heat or acidity.
C) They appear to be the molecular carriers of coded hereditary information.
D) They have both functional and structural roles in the body.
C
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The portion of the adult brain that includes the cerebral peduncles, superior colliculi, and inferior colliculi is derived from which secondary brain vesicle?
A. Telencephalon B. Diencephalon C. Myelencephalon D. Metencephalon E. Mesencephalon
Changes in the membrane potential that cannot spread far from the site of stimulation are called
A) threshold. B) graded potentials. C) refractories. D) hyperpolarizations. E) action potentials.
Which of the following statements about bronchioles is true?
A) Sympathetic action causes bronchodilation. B) Walls contain hyaline cartilage. C) Extreme bronchodilation occurs in asthma. D) The muscular walls are composed of a mixture of skeletal and smooth muscle. E) Segmental bronchi are braches of terminal bronchioles.
Fast fibers can be distinguished from slow fibers by the rate at which their myosin-ATPases split ATP
Indicate whether the statement is true or false.