Cuvier, an anatomist and paleontologist, proposed that ____.
A. all present-day organisms have descended, with adaptations, from one—or possibly a few—riginal organisms
B. Earth's history has been marked by several periods when destruction of populations was widespread and that, after each such period, the earth was repopulated
C. evolutionary changes in organisms are caused by use and disuse
D. although evolution is responsible for all the changes that happen to species, one center of creation resulted in the original members of each species
E. geologic processes in Earth have not changed over billions of years
Answer: B
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Actinomycetes produce many of the antibiotics we use in medicine.
Answer the following statement true (T) or false (F)
The infective larvae of the parasite S. stercoralis penetrate the skin and migrate through the circulatory system to the heart and lungs. The organism enters the bronchial tree and is then swallowed, entering the digestive tract, where the organism matures into an adult worm. This parasite is classified as which type of infection?
a. Pinworm b. Threadworm c. Whipworm d. Hookworm
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.
In the general regression equation y = mx + b, variables m and b represent ________ and ________, respectively
A) the x-intercept, the y-intercept B) the regression line slope, the y-intercept C) the y-intercept, the regression line slope D) the y-intercept, the x-intercept E) narrow-sense heritability, broad-sense heritability