As males and females age they produce lower volumes of sex hormones. For women, taking testosterone to increase
libido in becoming more common. Why is the same not common for males? What will be an ideal response?
ANSWER: While both males and females make less testosterone as they age, it is important to remember
that males decline from a much, much higher peak volume than do females. Thus, as males
age the volume of testosterone is still considerable, whereas for females the low volume they
made when younger gets lower still.
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The term amphipathic refers to those molecules that are
A) hydrophilic. B) hydrophobic. C) charged at both ends but with opposite charges. D) nonpolar at both ends. E) charged at one end and nonpolar at the other.
The innermost membrane layer surrounding the brain and spinal column is the:
a. dura mater. b. meninges. c. arachnoid. d. pia mater.
Other than predation by introduced Nile perch, the most likely explanation for the recent decline in cichlid species diversity in Lake Victoria is _____
A) reinforcement B) fusion C) stability D) polyploidy
Which is a general equation that summarizes the light-dependent reactions?
A. excited electrons + H2O + ADP + NADP+ ® ATP + NADPH + O2 B. ATP + NADPH + ribulose + CO2 ® ADP + NADP+ + complex organic molecule + ribulose C. CO2 + ATP + NADH + 5-ribulose ® glyceraldehyde-3-phosphate + NADP+ + ADP + P D. SUN + 6CO2 ® 6H2O + C6H12O6 + 6O2