On Figure 37-4, which of the fruit listed is formed by the fusion of ovaries from many flowers?
a. f
b. g
c. h
d. i
e. j
C
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. The burning of fossil fuels produces CO2, removing O2 from the atmosphere
It has been estimated that approximately three molecules of O2 are consumed by every single molecule of CO2 produced by fossil fuel combustion. Over about 20 years, a total loss of 0.0317% O2 from the atmosphere was calculated from this data. If you compare this graph to that shown in Figure 25.1, how is the trend in O2 levels related to the trend in CO2 levels? A. Both O2 levels and CO2 levels increase over time. B. Both O2 levels and CO2 levels decrease over time. C. O2 levels decrease as CO2 levels increase. D. O2 levels increase as CO2 levels decrease.
To mobilize more glucose _____ during fasting.
A. only cortisol will increase B. only epinephrine will increase C. only glucagon will increase D. only glucagon and cortisol will increase E. cortisol, epinephrine, and glucagon will all increase
_______ muscle is the muscle usually found in the walls of blood vessels and is important for regulating blood pressure.
A. Cardiac B. Skeletal C. Smooth
One type of illegal doping in sports is the abuse of anabolic steroids such as testosterone. Doctors measure the testosterone (T) to LH ratio in athletes' urine to detect such doping. Why is this an effective indicator?
A. Testosterone upregulates LH, so the doping athlete will have an unusually low T/LH ratio. B. LH has negative feedback onto testosterone, so the doping athlete will have an unusually high T/LH ratio. C. LH downregulates testosterone, so the doping athlete will have an unusually low T/LH ratio. D. Testosterone has negative feedback onto LH production, so the doping athlete will have an unusually high T/LH ratio.