What are the basic functional units of the nervous system?
A) muscle fibers
B) heart cells
C) neurons
D) fibroblasts
C
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Chitin, a modified form of cellulose, is not only cross-linked with proteins but its glucose units are modified with atoms of:
A. nitrogen. B. hydrogen. C. oxygen. D. sulfur. E. phosphorous.
If a particular atom has 27 electrons, 27 protons, and 31 neutrons, its mass number would be
A. 52. B. 54. C. 56. D. 58.
Which of the following statements about reproduction is NOT true?
A. A hermaphrodite produces both male and female gametes in different specialized gonads. B. Asexual reproduction is most advantageous when the environment is continually changing. C. A starfish can be cut into several pieces, and each piece will regenerate all the other parts of the individual. D. Hydras may reproduce asexually by budding new individuals from the parent. E. Gametes are produced by meiosis and may be specialized as eggs or sperm.
Compared to malaria, schistosomiasis infections are ________ numerous and ________ deadly
a. less / less b. less / more c. more / less d. more / more