One of the most important branch points in the evolution of animals and their nervous systems was the appearance of
A) radial symmetry.
B) bilateral symmetry.
C) the spinal column.
D) specialized cells for transmitting signals.
Answer: B
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An advantage of YACs over other vectors in cloning human genes is that they ____
a. are taken up more readily by recipient cells b. have a higher capacity for carrying long DNA fragments c. are less likely to trigger cell rejection d. resemble a human chromosome more closely than do other vectors e. carry long regions of human-like DNA
When a gene is transcribed, what is produced?
a. more DNA b. protein or polypeptide sequences c. messenger RNA d. enzymes e. genetic defects
The difference between somatic cell gene therapy and germline therapy is that
A. germline therapy is the temporary repair of a genetic mutation, whereas somatic cell therapy is a permanent fix. B. germline therapy overcomes a protein malfunction in specific tissues but is not repaired in the entire organism and cannot be passed on to offspring. C. somatic cell gene therapy is introduced into the egg, sperm or developing embryo, whereas germline therapy introduces a new gene into a mature tissue. D. somatic cell gene therapy overcomes a protein malfunction in specific tissues but is not repaired in the entire organism and cannot be passed on to offspring.
Which of the following will influence a physician's decision to prescribe an antimicrobial?
A. patient age B. liver function C. pregnancy D. alcohol use E. All of these choices are correct.