What is the relationship between recombination frequency and the actual physical distance on a chromosome?
A. As physical distance increases, the recombination frequency decreases in a linear fashion.
B. As physical distance increases, the recombination frequency first increases, but then decreases.
C. As physical distance increases, the recombination frequency increases in a linear fashion.
D. As physical distance increases, the recombination frequency first increases in a linear fashion, but gradually levels off to a frequency of 0.5.
Answer: D
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Which of the following is true regarding anabolic steroids?
A. Anabolic steroids were first developed by pharmaceutical companies in the late 1800s for the treatment of diseases associated with muscle wasting. B. Anabolic steroids are developed from estrogen, the female sex hormone. C. Because the use of anabolic steroids is illegal without a prescription, the purchase of these compounds has decreased over the past twenty years. D. Anabolic steroids have been found to cause few side effects and do not pose a serious health risk. E. Anabolic steroids increase muscle mass and are thought to help improve athletic performance.
When the SRY gene of the Y chromosome becomes active (around 7 weeks),
a. the Müllerian and Wolffian ducts both develop into male reproductive structures. b. the Müllerian ducts develop into male reproductive structures and the Wolffian ducts disappear. c. the Müllerian ducts disappear and the Wolffian ducts develop into male reproductive structures. d. the Müllerian and Wolffian ducts both disappear. e. the Müllerian and Wolffian ducts both develop into female reproductive structures.
The human brain is fully functional by the end of the ____
a. first trimester b. third month c. third trimester d. ninth month e. seventh month
When Peter Agre and colleagues compared frog oocytes expressing aquaporin with control oocytes lacking aquaporin placed in pure water, they found that
A) the control oocytes lacking aquaporin swelled and burst as water was transported into the cells. B) the oocytes expressing aquaporin swelled and burst as water was transported into the cells. C) the oocytes expressing aquaporin collapsed as water was transported out of the cells. D) the oocytes expressing aquaporin first swelled and then collapsed as water was transported into and then back out of the cells. E) the oocytes expressing aquaporin first collapsed and then swelled as water was transported out and then back into the cells.