Which animal are characterized by a four-chambered heart and hollow, light, limb bones?
a. mammals
b. lizards
c. birds
d. snakes
Ans: c. birds
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Which of the following statements best supports the claim that natural selection has favored genes that underpin a species-specific behavior?
A. An individual avoids certain locations or substances associated with negative experiences. B. A male responds to a female-produced pheromone. C. Humans acquire a specific language. D. Threatening silhouettes provoke defensive, crouching postures in chicks.
You have a patient who complains of pain in his joints. You ask whether he drinks much water during the day and find out he does not. You therefore suspect conversion of his usual nitrogenous waste ___________ into ____________, followed by deposition into his joints.
A. ammonia, urea B. urea, ammonia C. uric acid, urea D. urea, uric acid E. uric acid, ammonia
Humans, as well as all other mammals, have hair. Hair, then, would be considered to be a(n):
a. derived character. b. cladistic character.
c. ancestral character. d. analogous character. e. polyphyletic character.
Under anaerobic conditions, muscle cells produce ____.
a. ethyl alcohol b. pyruvate c. acetaldehyde d. citrate e. lactate