Mary is a long-distance runner and trains regularly. Recently, Mary and her husband have unsuccessfully tried to conceive a child. To improve her chances of getting pregnant, why does her doctor suggest that she should stop training?
A) Low levels of body fat may lengthen the menstruation cycle.
B) Low levels of body fat may cause menstruation to cease.
C) Low levels of body fat may lead to excessive levels of estrogen and progesterone.
D) Low levels of body fat may increase fat deposition, thereby decreasing fertility.
B
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What is the map distance between the genes for flower color and fruit shape?
Assume that in watermelon plants the genes for flower color (Y = yellow; y = orange flowers) and fruit shape (R = round; r = oval) are on the same chromosome. You cross two true-breeding plants, one with yellow flowers and round fruit and the other with orange flowers and oval fruit. You take one of the F1 individuals and cross it with a plant that is homozygous recessive for both traits. You get the following in the F2: 300 yellow flowers, round fruit; 300 orange flowers, oval fruit; 100 yellow flowers, oval fruit, 100 orange flowers, round fruit. A. 25.0 B. 4.0 C. 40.0 D. 33.0 E. 100.0
The study of the spatial arrangement of elements in communities and ecosystems is known as
A. landscape ecology. B. community ecology. C. population ecology. D. ecosystem ecology. E. global ecology.
Taking into account the enzymes produced by the koala's digestive tract and the enzymes produced by the symbiotic microbes present in the caecum, koalas are least able to digest
a. lignin. b. starch. c. cellulose. d. protein. e. fats and oils.
If the syringe contains live R strain and heatkilled
S strain Streptococcus pneumoniae a. the mouse will live. b. live S strain bacteria will be detected in the mouse's blood. c. the mouse's blood will contain live pathogenic R strain bacteria. d. The dead S strain bacteria will transform to live R strain bacteria. e. DNA from the live R strain bacteria will revive the dead S strain bacteria.