Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges
Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species. These two juniper species are kept separate by _____. A) habitat isolation
B) temporal isolation
C) gametic isolation
D) behavioral isolation
C
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Yogurt contains galactose and glucose, which are generated when bacterial enzymes act on milk sugars. What is the main source of the galactose in yogurt?
A. Maltose B. Sucrose C. Lactose D. Fructose E. Glycogen
Which event could result in an inversion?
A) A 360° rotation of a chromosomal region following two double-strand breaks in a chromosome's DNA. B) A crossover between two DNA sequences in different places on the same chromosome and that are inverted repeats of each other. C) A crossover between two repeated DNA sequences that are in different places on the same chromosome and are oriented in the same direction. D) A crossover between two repetitive sequences on different chromosomes.
Some ecologists have proposed that environmental heterogeneity in the tropics leads to greater diversity of trees. Which of the following assumptions underlying this concept seem(s) unlikely?
A) Tropical plants recognize much finer habitat differences in the tropics than they do in temperate regions. B) There is more environmental heterogeneity in the tropics than in temperate regions. C) Both of the above.
In prophase, the nuclear membrane disappears
Indicate whether the statement is true or false