The loss of ________ that occurs at each trophic level places a limit on how many top-level carnivores a community can support.
A. CO2
B. water
C. light
D. O2
E. energy
Answer: E
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Which of the following would also work as an enhancer for the following bi-directional enhancer?
5' GTTC 3' 3' CAAG 5' A. 5' GAAC 3' 3' CTTG 5' B. 5' CTTG 3' 3' GAAC 5' C. 5' CAAG 3' 3' GTTC 5' D. 5' CTTC 3' 3' GAAG 5'
Which of the following arose first?
a. animals b. archaea c. fungi d. protists e. plants
Eric was working very hard in the dry, hot boiler room and sweating a lot. Under these conditions, which of the following might Eric be experiencing?
A) He has decreased hydrocortisone. B) He has increased oxytocin. C) He has increased antidiuretic hormone. D) He has decreased thyroxine.
In humans, genes make up ______ percent of the DNA.
A) less than 5 B) about 10 C) about 50 D) 100 E) about 75