Which scenario best describes the terms "subspecies" and "race"?
A) a population of rabbits that lives near a lake and sometimes breeds with rabbits farther inland
B) two populations of birds that have different amounts of orange coloration and could produce offspring if they were not separated by a mountain range
C) two populations of frogs that cannot produce offspring
D) a breed of dog with a longhaired coat instead of a shorthaired coat
B
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Why can an infection in the brain's ventricles usually be detected in spinal fluid obtained from the lower back (lumbar region)?
A. Cerebrospinal fluid (CSF) originates in the ventricles, but percolates over and around the brain and spinal cord. B. There is a high degree of vascularity that exists, allowing easy transfer of bacteria in the cerebrospinal fluid (CSF) and the blood. C. There is a set of lymph nodes specifically in place to drain the cerebrospinal fluid (CSF) from the ventricles. They are housed in the lumbar region of the spinal column, adjacent to the spinal cord. D. This is an incorrect statement. Since the central nervous system (CNS) is a protected site due to the blood-brain barrier, there can never BE an infection in the ventricles.
Which of the following is(are) an organism’s niche?
a. living and environmental factors b. its general ecological role c. the organism’s relationship with other living organisms d. All of these constitute part of an organism’s niche
The multicelled projections that protrude from the lining of the small intestine are called ____
a. sphincters b. brush borders c. microvilli d. villi e. macrovilli
Steroid hormones and thyroid hormones do not
require a membrane receptor because they a. are small enough to pass directly through the membrane. b. are soluble in the lipid bilayer. c. pass through special membrane channels. d. are water-soluble. e. dissolve in the cholesterol of the membranes.