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07:47A 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
How many genes are there in a human sperm cell?
a. 23
b. 46
c. About 21,000
d. about 3 billion
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.
A biologist isolated a gene from a human cell, inserted it into a plasmid, and inserted the plasmid into a bacterium. The bacterium made a new protein, but it was nothing like the protein normally produced in a human cell. Why? (Explain your answer.)
a. The bacterium had undergone transformation.
b. The gene did not have sticky ends.
c. The human gene contained introns.
d. The gene was not synthesized from scratch.
