How many semicircular canals are in the inner ear of the right ear?
A) One B) Two C) Three D) Four
C
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Which of the following is a common reason for hybrid infertility?
a. They express mechanical incompatibility. b. They are found to be ecologically isolated. c. A common reason for hybrid infertility is the failure of chromosomes to pair properly during meiosis. d. They fail to reach sexual maturity.
The total of all the resources, both biotic and abiotic, that a species exploits for its survival, growth, and reproduction is its
A. competitive zone. B. habitat. C. food web. D. niche. E. biosphere.
You inoculate a bacterium into three tubes of nutrient broth medium containing added salt: 0.5% NaCl, 5% NaCl, and 15% NaCl. After incubation, you notice significant turbidity in the 15% NaCl medium and modest turbidity in the 5% NaCl medium. There is no growth in the third tube. This organism would be termed ________.
A. halophilic B. barophilic C. haloduric D. osmophobic
For heart muscles to beat in a coordinated rhythm ions must move from one cell to the next through ____.
A. gap junctions B. hemidesmosomes C. focal adhesions D. adherens junctions E. desmosomes