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08:09
05:02Which of the following would be considered a transgenic organism?
a. A bacterium that has received genes via conjugation
b. A human given a corrected human blood-clotting gene
c. A fern grown in cell culture from a single fern root cell
d. A rat with rabbit hemoglobin genes
The DNA profiles used as evidence in a murder trial look something like supermarket bar codes. The pattern of bars in a DNA profile shows
a. The order of bases in a particular gene.
b. The presence of various-sized fragments of DNA.
c. The presence of dominant or recessive alleles for particular traits.
d. The order of genes along particular chromosomes.
A paleontologist has recovered a tiny bit of organic material from the 400-year-old preserved skin of an extinct dodo. She would like to compare DNA from the sample with DNA from living birds. Which of the following would be most useful for increasing the amount of DNA available for testing?
a. Restriction fragment analysis
b. Polymerase chain reaction
c. Molecular probe analysis
d. Electrophoresis
When a typical restriction enzyme cuts a DNA molecule, the cuts are uneven, giving the DNA fragments single-stranded ends. These ends are useful in recombinant DNA work because
a. They enable a cell to recognize fragments produced by the enzyme.
b. They serve as starting points for DNA replication.
c. The fragments will bond to other fragments with complementary ends.
d. They enable researchers to use the fragments as molecular probes.
