Many people think long-term evolution of a species must follow the rule "adapt or die." Which of the following will not help organisms overcome an environmental change that threatens extinction?
A. The will to survive
B. High levels of genetic variation
C. A large population size
D. Phenotypic plasticity that buffers environmental change
E. A high rate of beneficial mutations
Answer: A. The will to survive
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When nitrogen oxides and sulfur dioxide combine with water vapor in the air, they are converted to nitric acid and sulfuric acid, respectively. This precipitation that then falls to the Earth is known as
A) decomposition acid. B) acid fog. C) acid deposition. D) acid precipitation. E) nitrogen precipitation.
Myelin speeds the conduction of action potentials along a neuron by
A) lowering the threshold at which action potentials are generated. B) allowing the action potential to "jump" over sections of the axon. C) inserting additional voltage-gated K+ channels into the membrane. D) increasing the resting membrane potential. E) increasing the diameter of the axon.
Which of the following treatments is the most effective for controlling microbial growth?
A) 63°C for 30 minutes B) 72°C for 15 seconds C) 140°C for 4 seconds D) They are equivalent treatments. E) None of the answers is correct.
Where is the apical foramen of the developing tooth?
A. At the root of the tooth; The blood vessels and nerves enter the pulp here. B. Between adjacent developing teeth; The apical foramen is the gap between adjacent teeth. C. Between the developing tooth and the oral cavity: The apical foramen is the hole through which the tooth will emerge. D. Between the growing mass of dentin and odontoblasts; Dentin is secreted into this foramen by odontoblasts. E. Surrounding it; The apical foramen is the cavity in which the tooth develops.