Why would gene duplication events, such as those seen in the Hox gene complex, set the stage for adaptive radiation?
A) There are more copies of genes, meaning speciation had occurred by polyploidy.
B) The original gene copy is the outgroup, and the new gene copies are the adaptive radiation.
C) Without duplicated genes, species would be vulnerable to extinction.
D) One copy of a gene can perform the original function, while other copies are available to take on new functions.
D
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The current status of gene therapy is:
a. it is currently being used effectively to cure cystic fibrosis. b. it has been terminated because clinical trials have shown that it is ineffective. c. it is being evaluated to assess the risks associated with potential side effects. d. the number of clinical trials is increasing at an almost uncontrolled rate. e. that it may be considered in the future, but currently the technology is not available.
As a researcher, you are charged with determining the side effects of a new drug. From previous observations, you
suspect that this drug reduces the rate of DNA production (replication) within skin cells of patients using the drug. With the following materials, design an experiment that would answer your questions about the effect of the drug on DNA production. You know that: DNA contains phosphate groups. You have: radioactive isotopes of phosphate (32P), skin cell cultures from various patients, the drug in question, and a device that measures radioactivity. What will be an ideal response?
Which mutations can interfere with the proper insertion of a protein in the plasma membrane?
A. a nonpolar amino acid to a polar amino acid within a transmembrane domain B. a polar amino acid to a nonpolar amino acid within a cytoplasmic domain C. a nonpolar amino acid to a polar amino acid within a cytoplasmic domain D. a polar amino acid to a nonpolar amino acid within a transmembrane domain
What type of symbiotic relationship is exemplified by athlete's foot?
A. Commensalism B. Atavism C. Mutualism D. Parasitism