In DNA molecules,
A. cytosine pairs with adenine.
B. thymine pairs with uracil.
C. adenine pairs with uracil.
D. adenine pairs with thymine.
E. cytosine pairs with thymine.
D. adenine pairs with thymine.
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An individual that has two dominant alleles for a trait (AA) is __________. Fill in the blank(s) with the appropriate word(s)
One feature of "engineered" plasmids that is helpful in the isolation and analysis of cloned DNA is:
a. they can only handle DNA fragments of up to 10 kb. b. that they are an integral part of all eukaryotic cells. c. they contain no genetic material of their own so that the cloned fragment is truly isolated. d. the presence of genes that allow transformed cells to survive on different media. e. the base sequence of one strand reads the same asits complement
In 1858, a German scientist named Rudolph Virchow stated that spontaneous generation of living things from nonliving matter was impossible. This statement contributed to the development of the cell theory. In effect, what was Virchow saying?
A) Cells exist in a wide variety of shapes and sizes. B) All cells come from existing cells. C) The cell is the basic unit of all organisms. D) Cells are alive.
Half the trees in an orchard were derived from rootstock "A" and half from rootstock "B," but all the trees had the same scion. If the trees grafted onto rootstock "A" were infected by a parasite that causes blossom rot, the trees grafted onto rootstock
"B" A) would be less likely to become infected because they're grafted onto different rootstocks. B) would be more likely to become infected, since the pathogen would spread through the soil to the roots of other trees. C) would be very likely to become infected, because the remaining scions are genetically identical to those that are already infected. D) There's no way to determine the likelihood of infection, since genetic variability gives all the trees different characteristics.