New genes can evolve from all of the following except
a. gene duplication from unequal crossing over.
b. gene duplication from replicating transposable elements.
c. gene duplication from crossing over.
d. exon shuffling.
e. combining parts of two or more genes.
C
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Neurons in the higher vocal center of a male zebra finch's brain are stimulated to proliferate by testosterone
a. True b. False
Concerning the sex chromosomes, which of the following is correct?
a. The Y chromosome carries a greater number of nonsexual traits. b. X and Y are different in size but carry nearly equal numbers of genes. c. The X chromosome carries more genes for nonsexual traits. d. The X chromosome carries only gender-related genes. e. The X chromosome carries the SRY gene.
How have classification systems for living things changed over the years?
A) Scientists have always recognized five kingdoms of living things, but the placement of species within those kingdoms has changed. B) Until the last 20 years, organisms had been classified first as animal or plant. Recently, a five-kingdom system became the preferred classification system. C) The three-domain system has been introduced within the last 30 years, to supplement the five-kingdom system. D) The exact organization proposed in the eighteenth century by Carl Linnaeus has recently been reinstituted by scientists.
Complement is a complex defense system that results, by way of a cascade mechanism, in the formation of a membrane attack complex that kills cells by creating holes in their membranes.
a. true b. false