Which of these is NOT one of the characteristics of a vertebrate?
A. closed circulation
B. segmentation
C. extreme cephalization
D. radial symmetry
E. coelom
Answer: D
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Which of the following statements regarding vaccines as disease preventatives is incorrect?
A. There is currently no smallpox vaccine available to the general public. B. Immunization is currently not possible against Clostridium perfringens. C. Zostavax is recommended for older adults to prevent shingles. D. The Carter Center has promoted the development of a vaccine against river blindness.
The heart’s pacemaker is located in structure
a. A. b. B. c. D. d. E. e. none of these.
What biochemical clues support the idea that all living things evolved from one common ancestor?
What will be an ideal response?
In plants, most differentiated cells retain
A) only a tiny fraction of their original set of genes. B) a complete set of their genes but lose the ability to express most of those genes. C) a complete set of their genes and retain the ability to express those genes under certain circumstances. D) the ability to dedifferentiate but then cannot return to their original differentiated state.