Bumblebees pollinate M. lewisii, whereas hummingbirds prefer the M. cardinalis. If, by chance, a hummingbird carries M. cardinalis pollen to M. lewisii, the resulting hybrid offspring are viable. M. lewisii and M. cardinalis are different species due to
A. independent assortment.
B. adaptive radiation.
C. gradualism.
D. postzygotic barriers to reproduction.
E. prezygotic barriers to reproduction.
E. prezygotic barriers to reproduction.
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In most fungi, karyogamy does not immediately follow plasmogamy, which consequently _____
A) means that sexual reproduction can occur in specialized structures B) results in multiple diploid nuclei per cell C) allows fungi to reproduce asexually most of the time D) results in heterokaryotic or dikaryotic cells E) is strong support for the claim that fungi are not truly eukaryotic
What is the primary function of the transverse tubules?
A. They conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. They act as a channel for Ca2+ ions during excitation-contraction coupling. C. They form cross-bridges between actin and myosin during muscle contraction. D. They attach troponin to tropomyosin. E. They attach muscle fibers to skeletal elements to exert force.
In which of the following part or parts of the
life cycle are duplicated chromosomes NOT connected to each other?
a. G1 b. S c. G2 d. metaphase e. more than one of these
Evolution of the globin gene family has been characterized by
a. duplication and divergence of genes. b. fusion of exons. c. duplication of gene clusters. d. mutations creating pseudogenes. e. All of the above.