Which one of the following was not an adaptation seen in the sharks (Chondrichthyes)?
A. Calcified cartilaginous skeleton
B. Swim bladder
C. Lateral line system
D. Internal fertilization and internal development
E. Teeth
Answer: B
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Why are sensory organs, such as eyes, located on the surface of the body?
A. Their location is adaptive; it allows sensory organs to receive input from the environment. B. Their location is adaptiveit allows sensory organs to receive input from the central nervous system. C. Their location is an artifact of development; these structures are derived from mesoderm. D. Their location is an artifact of development; these structures are derived from endoderm. E. None of the answer options is correct; there is a better explanation that is not listed.
An essential amino acid is best defined as one that:
A. cannot be synthesized by cellular biochemical pathways. B. is necessary for building proteins. C. cannot be obtained through the diet. D. functions as a vitamin. E. is required in large amounts.
The purple nonsulfur bacteria
A. utilize organic molecules as a source of electrons for photosynthesis. B. typically can grow aerobically in the dark as chemoorganoheterotrophs. C. grow anaerobically as photoorganoheterotrophs. D. All of the choices are correct.
During gas exchange, body cells
A) take up CO2 and release O2. B) release O2 to red blood cells. C) increase in size to accommodate the reuptake of O2. D) release CO2 and take up O2.