Paedomorphosis is
A. the formation of limbs from fins in the evolution of land vertebrates.
B. the change from radial to bilateral symmetry in the evolution of plants and animals.
C. the retention of juvenile traits in an adult organism.
D. an earlier development of adult traits in an organism.
E. the development of different types of eyes from a simpler form.
C. the retention of juvenile traits in an adult organism.
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In a heterozygous individual, the allele being expressed is
A. recessive. B. codominant. C. pleiotropic. D. dominant. E. epistatic.
You isolate the DNA from a previously unknown virus and determine the melting point of the nucleic acid in the virus. What pattern, trace A, B, C, or D,would you expect if the virus DNA is single stranded?
A. trace A B. trace B C. trace C D. None of these traces represents the pattern forsingle-stranded DNA.
One difference between sieve-tube cells and vessels is that sieve-tube cells are ________, but vessels are dead.
A. hollow B. alive C. nucleated D. more spherical E. placed end to end
Inactivation of a fluorescent dye in a very concentrated spot on a cell so that the fluidity of membranes can be visualized is called
A) liposome formation. B) SDS-PAGE. C) photobleaching. D) the freeze-fracture technique. E) ferritin-conjugated lectins.