Refer to the figure. What is the most likely concentration of the fluid in region E during moderate-volume urine production?
A. 1400 mOsm
B. 700 mOsm
C. 75 mOsm
D. 300 mOsm
E. 5 mOsm
Answer: B
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Which of the following would NOT be a characteristic of the first life forms on Earth, that is, the very first primitive cells?
A. Oxygen was required for the cells to survive. B. A molecule evolved as a way to store genetic information. C. A barrier made of organic molecules separated the "cell" from the environment. D. Chemical reactions evolved as a way for cells to capture energy from the environment.
For many mammals, egg laying is a character that has been replaced by:
A. live birth. B. asexual reproduction. C. sexual reproduction.
How many chromosomes do Klinefelter and Turner syndromes have, respectively?
What will be an ideal response?
Currently, atmospheric CO2 levels are approximately 400 ppm. The annual mean growth rate in CO2 is about 2 ppm/year. Assuming this trend continues, what would you predict the CO2 level to be in 100 years?
A) 100 ppm B) 200 ppm C) 600 ppm D) 1,000 ppm