Explain how a person detects gravitational equilibrium.
What will be an ideal response?
Within the vestibule are the utricle and saccule. Both sacs contain tiny hair cells that have stereocilia embedded within a gelatinous material called the otolithic membrane. Calcium carbonate granules (otoliths) rest on the membrane. When the head is turned the otoliths move. The utricle detects the movement of the otoliths when the head is moved back and forth. The saccule detects the movement of the otoliths when the head is moved up and down. It is the movement of the otoliths against the stereocilia that stimulate the nerve fiber and send the impulse to the brain to indicate that the head has changed position.
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True or False: it is likely that the first photosynthetic organisms utilized chlorophyll, demonstrating the ancient origins of modern photosynthesis
A. true B. false
Genes that are always "turned on" in a cell are referred to as
A) regulated genes. B) mutations. C) inducible. D) constitutive. E) catabolic.
What best describes index fossils?
a. Organisms that existed over a limited period b. Organisms whose age is hard to detect c. Fossils that are used in radioactive dating d. Fossils of the most ancient organisms
A newly mated queen ant establishes an ant nest in an unoccupied patch of suitable habitat. Assuming that no disasters strike the nest, which of the following types of equation will best describe its population growth?
A) linear B) quadratic C) logarithmic D) logistic E) exponential