Most mesophilic organisms can grow in a temperature range of
A) 0-15 °C.
B) 10-20 °C.
C) 20-40 °C.
D) 50-65 °C.
Answer: C
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How does a swim bladder help the ray-finned fishes maintain buoyancy?
A) It removes water from the digestive tract. B) It removes oxygen from the water and stores it. C) Gas is added to the bladder as the fish's depth increases. D) Gas is removed from the bladder as the fish's depth increases. E) It adds and removes salt from the water stored in the bladder, which changes its density and thus its buoyancy.
Each cone responds primarily to a single color. What kinds of cones are present in the human retina?
a. Two cones that perceive red or blue light. b. Three cones that perceive red, blue, or green light. c. Three cones that perceive orange, green, or purple light. d. Three cones that perceive red, blue, or yellow light. e. Four cones that perceive red, blue, yellow, or green light.
Most density-dependent factors show negative feedback relative to population size. Which one of the following is more likely to show positive feedback relative to population size?
A. mortality in large populations B. competition in small populations C. competition in large populations D. fecundity in small populations E. fecundity in large populations
Where are you most likely to find bacteria belonging to the domain Archaea?
A) A human's large intestine B) A sewage treatment plant C) In a hot spring D) A beer production facility E) A pond