To determine the nucleotide sequence in DNA, scientists now use
a. electron microscopy.
b. antibiotic resistance.
c. automated DNA sequencing.
d. radioactive tracers.
e. viruses.
C
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At first glance cycads and palm trees look very similar. How are they distinguished?
A. Cycads have cones and palm trees, an angiosperm, have flowers. B. Cycads have cones, and palm trees, a gnetophyte, have single large fruits. C. Cycads have bare seeds and palm trees produce cones. D. Cycads are fertilized by wasps and palm trees are fertilized by water. E. Cycads are small shrubs and palm trees are trees.
Pandas are an example of a(n) ____ species that is in danger of extinction because they are dependent on disappearing
bamboo forests.
a. “extinct in the wild” b. extinct c. indicator d. endemic e. keystone
You and a friend are student assistants in a research laboratory that investigates the anticancer properties of proteins isolated from marine organisms. Your friend mentions that she is using a BAC vector to insert shark DNA into Escherichia coli, but after repeated attempts, has found that the bacterial cells fail to synthesize the encoded protein. What is your advice?
A. If the shark DNA is unmodified, it contains introns that are not recognized by bacteria, therefore protein synthesis will not occur. B. Because Escherichia coli is not naturally competent, it cannot serve as the cloning host for foreign DNA. C. Since shark DNA is eukaryotic, the cloning vector should be a YAC derived from yeast rather than a BAC derived from bacteria. D. It is impossible to clone eukaryotic DNA into a bacterial host, since eukaryotic DNA has introns and prokaryotic DNA does not.
The X-ray diffraction pattern for DNA suggested to Wilkins and Franklin all of the following features about DNA EXCEPT
A) a DNA molecule has a uniform diameter of 2 nanometers. B) the phosphate-sugar "backbone" of the molecule is on the outside of the DNA helix. C) the DNA molecule consists of repeating subunits. D) a DNA molecule is helical. E) in a DNA molecule, A pairs with T and G pairs with C.