How can you tell the difference between the sound of a tuba and that of a flute?
A. Each part of the spiral organ is sensitive to different wave frequencies.
B. Lower pitches activate all three bones of the middle ear, while higher pitches only activate one or two.
C. The cochlear nerve fires more frequently for higher pitches and less frequently for lower pitches.
D. The brain interprets pitches based on the strength of the sound waves.
E. Lower pitches cause the tympanic membrane to vibrate, while higher pitches vibrate the vestibular canal.
Answer: A
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How do citrus fruits such as lemons cause the basic taste of sour?
A) The more acidic the food is, the more depolarization of the sensory receptor occurs. B) Ascorbic acid binds to sensory receptors on the plasma membrane of taste cells, which leads to the triggering of cellular activity that trigger a sour taste response. C) Sugars and ascorbic acid bind sensory receptors on the plasma membrane of taste cells, which leads to the triggering of cellular activity that trigger a sour taste response. D) Citric acid amplifies the sour taste of vitamin C when it binds to specialized receptors on the taste cells.
The selective movement of specific small molecules and ions into excretory system tubules is called ____
a. reabsorption b. excretion c. filtration d. secretion
e. diffusionWhich statement most completely describes why the pea plant was an excellent choice for Mendel's experiments?
a. True-breeding varieties were available. b. The plant can self-fertilize. c. The plant can be cross-fertilized. d. True-breeding varieties were available, and it can be cross-fertilized. e. True-breeding varieties were available, the plant can self-fertilize, and it can be cross-fertilized.
A mutation in a gene often results in a reduction of the product of that gene. The term for this type of mutation is ________
A) gain of function B) loss of function or null (in the case of complete loss) C) codominance D) multiple allelism E) incomplete dominance