True or false: The sequence of species that colonize a recently disturbed area through succession is unpredictable
A. true
B. false
B
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Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions. B. a boundary membrane that separates external from internal environments. C. the ability to exclude all organic substances. D. the ability to fuse with any other protobiont for reproduction. E. the ability to recognize other protobionts for developmental purposes.
The movement of molecules across a membrane from an area of lower concentration to an area of higher concentration with the expenditure of energy is called
A. active transport. B. passive diffusion. C. osmosis. D. facilitated diffusion.
Chagas disease mainly occurs in ________ countries and is transmitted by the “kissing bug.”. Although the acute illness is self-limiting, chronic disease usually results in ________
a. African / lung failure b. African / heart disease c. Latin American / lung failure d. Latin American / heart disease
Which of the following statements about the organs of balance and equilibrium is false?
A. The three semicircular canals of the vestibular apparatus function in dynamic equilibrium. B. At the base of each semicircular canal is a bulging region called the ampulla. C. The brain receives and integrates signals from the semicircular canals on both sides of the head. D. dynamic equilibrium allows you to keep your eyes locked on an object even when you swivel your head or nod. E. Organs in the saccule and utricle act in the sense of dynamic equilibrium.